Step Mania v5.0 beta4a keeps crashing on startup

On OS X, the log files can be found at:

~/Library/Logs/StepMania 5/

Other ("hidden") folders of interest include:

User content:

~/Library/Application Support/StepMania 5/

Cache:

~/Library/Caches/StepMania 5/

"Initialising Hardware" is an error message I've never come across. Hopefully the log will tell us more...

I just checked and originally there were no songs installed. I have added the songs' folders in now under the folder StepMania 5 and it still doesn't work.
There should already be a Songs directory with a StepMania 5 directory inside of it that contains three songs.

It suggests that something went wrong during the installation if you really don't have that...

00:00.208: StepMania v5.0 beta 4a
00:00.208: Compiled Sun Oct 19 20:50:22 EDT 2014 @ (build 12)
00:00.208: Log starting 2014-12-20 05:36:01
00:00.208:
00:00.209: Reading 'Data/Defaults.ini' failed: No such file or directory
00:00.210: Reading 'Data/Static.ini' failed: No such file or directory
00:00.210: Reading 'Data/Static.ini' failed: No such file or directory
00:00.270: Loading window: macosx
00:00.271: Model: MacBookPro11,1 (4/4)
00:00.271: Clock speed 2.40 GHz
00:00.271: Mac OS X Unknown
00:00.271: Memory: 8.00 GB
00:00.272: ThemeManager::SwitchThemeAndLanguage: "default", "en"
00:00.293: Loading "/Scripts/32log.lua" ...
00:00.294: Loading "/Scripts/extend_table.lua" ...
00:00.294: Loading "/Scripts/unavailable_functions.lua" ...
00:00.294: Loading "/Scripts/32log.lua" ...
00:00.294: Loading "/Scripts/extend_table.lua" ...
00:00.294: Loading "/Scripts/unavailable_functions.lua" ...
00:00.295: Loading "/Themes/_fallback/Scripts/00 init.lua" ...
00:00.295: Loading "/Themes/_fallback/Scripts/01 alias.lua" ...
00:00.295: Loading "/Themes/_fallback/Scripts/01 base.lua" ...
00:00.295: Loading "/Themes/_fallback/Scripts/01 IniFile.lua" ...
00:00.296: Loading "/Themes/_fallback/Scripts/02 Actor.lua" ...
00:00.296: Loading "/Themes/_fallback/Scripts/02 ActorDef.lua" ...
00:00.297: Loading "/Themes/_fallback/Scripts/02 Branches.lua" ...
00:00.297: Loading "/Themes/_fallback/Scripts/02 Colors.lua" ...
00:00.298: Loading "/Themes/_fallback/Scripts/02 Debug.lua" ...
00:00.298: Loading "/Themes/_fallback/Scripts/02 Enum.lua" ...
00:00.298: Loading "/Themes/_fallback/Scripts/02 OptionsMenu.lua" ...
00:00.298: Loading "/Themes/_fallback/Scripts/02 Other.lua" ...
00:00.299: Loading "/Themes/_fallback/Scripts/02 Serialize.lua" ...
00:00.299: Loading "/Themes/_fallback/Scripts/02 Sprite.lua" ...
00:00.299: Loading "/Themes/_fallback/Scripts/02 StageMods.lua" ...
00:00.300: Loading "/Themes/_fallback/Scripts/02 ThemePrefs.lua" ...
00:00.300: Loading "/Themes/_fallback/Scripts/02 ThemePrefsRows.lua" ...
00:00.301: Loading "/Themes/_fallback/Scripts/02 Utilities.lua" ...
00:00.303: Loading "/Themes/_fallback/Scripts/03 CustomSpeedMods.lua" ...
00:00.304: Loading "/Themes/_fallback/Scripts/03 Gameplay.lua" ...
00:00.304: Loading "/Themes/_fallback/Scripts/03 GamePreferences.lua" ...
00:00.304: Loading "/Themes/_fallback/Scripts/03 ThemeAndGamePrefs.lua" ...
00:00.305: Loading "/Themes/_fallback/Scripts/03 ThemeLibrary.lua" ...
00:00.305: Loading "/Themes/_fallback/Scripts/03 UserPreferences2.lua" ...
00:00.305: Reading 'Themes/_fallback/ThemeInfo.ini' failed: No such file or directory
00:00.305: Loading "/Themes/_fallback/Scripts/04 CreditsHelpers.lua" ...
00:00.309: Loading "/Themes/_fallback/Scripts/04 LogDisplay.lua" ...
00:00.309: Loading "/Themes/_fallback/Scripts/04 NumPadEntry.lua" ...
00:00.310: Loading "/Themes/_fallback/Scripts/04 SetBGFitHelpers.lua" ...
00:00.310: Loading "/Themes/default/Scripts/00 ThemeInfo.lua" ...
00:00.310: Loading "/Themes/default/Scripts/02 Colors.lua" ...
00:00.311: Loading "/Themes/default/Scripts/02 Lyrics.lua" ...
00:00.311: Loading "/Themes/default/Scripts/02 TextBanner.lua" ...
00:00.311: Loading "/Themes/default/Scripts/02 ThemePrefs.lua" ...
00:00.312: ThemePrefs.InitAll( prefs )
00:00.312: ThemePrefs.Init: loading from disk
00:00.312: IniFile.ReadFile( Save/ThemePrefs.ini )
/////////////////////////////////////////
00:00.312: WARNING: ReadFile(Save/ThemePrefs.ini): No such file or directory
/////////////////////////////////////////
00:00.312: NotePosition doesn't exist, creating
00:00.312: GameplayFooter doesn't exist, creating
00:00.312: TimingDisplay doesn't exist, creating
00:00.312: GameplayShowScore doesn't exist, creating
00:00.312: ShowLotsaOptions doesn't exist, creating
00:00.312: FlashyCombo doesn't exist, creating
00:00.312: AutoSetStyle doesn't exist, creating
00:00.312: ComboOnRolls doesn't exist, creating
00:00.312: LongFail doesn't exist, creating
00:00.312: GameplayShowStepsDisplay doesn't exist, creating
00:00.312: FancyUIBG doesn't exist, creating
00:00.312: ComboUnderField doesn't exist, creating
00:00.312: Loading "/Themes/default/Scripts/03 Gameplay.lua" ...
00:00.312: Loading "/Themes/default/Scripts/04 Other.lua" ...
00:00.349: Starting thread: Decode thread
00:00.349: Sound driver: AudioUnit
00:00.349: Starting thread: Music thread
00:00.349: Initializing lights drivers: SystemMessage,Export
00:00.350: Lights driver: SystemMessage
00:00.350: Unknown lights driver: Export
00:00.350: ThemeManager::SwitchThemeAndLanguage: "default", "en"
00:00.354: Attempting to load 172 songs from "Songs/StepMania 5"
00:00.356: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_2-Dimensional Dream Fever)
00:00.361: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_@Cinammon Roll)
00:00.363: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[A0145] Hatsune Miku - Traveler)
00:00.364: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[A0145] Hatsune Miku - Vocaloid In Love)
00:00.367: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[A0145] Kagamane Rin - Kokoro)
00:00.368: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[A0145] Megurine Luka - Suffocation)
00:00.370: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei & Axel_TG] Megurine Luka - Corruption Garden)
00:00.371: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Hatsune Miku & Kagamine Rin - Reverse Rainbow)
00:00.373: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Hatsune Miku & Megurine Luka - Six Steps)
00:00.374: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Hatsune Miku - Happy Fruit!)
00:00.376: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Hatsune Miku - Light Song)
00:00.378: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Hatsune Miku - Wrapping Kiss)
00:00.379: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Kagamine Rin - I Can Take Off My Panties!)
00:00.380: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Kagamine Rin - I Like You, I Love You (Katahotori Remix))
00:00.382: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Akei] Kagamine Rin - Ur-Style)
00:00.384: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[akstylish] Hatsune Miku - Epidemic Girl)
00:00.385: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Axel_TG] Hatsune Miku - Chaining Intention)
00:00.387: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Axel_TG] Hatsune Miku - Hey)
00:00.388: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Axel_TG] Hatsune Miku - Two Breaths Walking)
00:00.389: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Axel_TG] Kagamine Rin - Hello World)
00:00.390: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Axel_TG] Megurine Luka - _theBlue)
00:00.391: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[CondorTalon] Infinity)
00:00.393: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[CondorTalon] Kisaragi Attention)
00:00.395: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Crimson] Hatsune Miku - Shinkai Summit)
00:00.396: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[D12rwin] Hatsune Miku & Megurine Luka- 1 Out Of 60000000)
00:00.398: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[D12rwin] Hatsune Miku - Be My Sacrifice)
00:00.400: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[D12rwin] Kagamine Len - Butterfly On Your Right Shoulder)
00:00.402: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[D12rwin] Lily - Lily Lily Burning Night)
00:00.403: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[D12rwin] Lily - Reason)
00:00.405: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[D12rwin] Lily - Super Sonic Dance)
00:00.406: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[DARKZAY] Hatsune Miku - Triangle Girl's Heart)
00:00.407: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[ddrtime] Hatsune Miku - Hello Planet)
00:00.409: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Detrimentalist] Megurine Luka - Answer)
00:00.410: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Ferrous] Hatsune Miku & Kamui Gakupo - Nehanshika)
00:00.412: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Ferrous] Hatsune Miku - High Sense Nonsense)
00:00.414: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Firippu] Kagamine Rin - Hold Me Like A Princess)
00:00.416: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gpop] Electric Angel (Remix))
00:00.418: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gpop] Just Be Friends)
00:00.419: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gpop] Tell Your World)
00:00.421: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gpop] Thousand Cherry Tree)
00:00.422: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gpop] Weekender Girl)
00:00.424: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gundam-Dude] Kasane Teto - Ochame Kinou)
00:00.425: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Gundam-Dude] Megurine Luka - Seven Per Eight)
00:00.426: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Joker)
00:00.428: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Kokoro-Game-Box)
00:00.430: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Love Atomic Transfer)
00:00.431: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Parade Of Liars)
00:00.433: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Rolling Girl)
00:00.435: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Standing In Your Way)
00:00.436: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Sweet Devil)
00:00.438: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Turkish March - Owata)
00:00.440: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - What Ah Yes)
00:00.441: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Hatsune Miku - Why It Became Like This)
00:00.444: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Kaito - A Thousand-Year Solo)
00:00.445: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Kasane Teto - Kasane Territory)
00:00.447: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Megurine Luka - Toeto)
00:00.449: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Hazenkain] Meiko - Be Myself)
00:00.451: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku & Megurine Luka - World's End Dancehall)
00:00.452: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku - Black Rock Shooter)
00:00.457: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku - Cinderella Romance)
00:00.458: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku - Melt)
00:00.459: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku - The Disappearance Of Hatsune Miku -Dead End-)
00:00.461: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku - Triangle Girl's Heart)
00:00.462: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Hatsune Miku - Turkish March - Owata)
00:00.463: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Huzure] Megurine Luka - Desire)
00:00.464: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Kommisar] Acme Iku - Chaosmaid)
00:00.466: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Kommisar] Gumi - Our 16 Bit Wars)
00:00.468: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Kommisar] Hatsune Miku - The Disappearance Of Hatsune Miku - Dead End-)
00:00.469: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Kommisar] Kagamine Rin - The Cursed Glasses)
00:00.470: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Mariesta] Various - Dream Meltic Halloween)
00:00.472: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Gumi - Kimi Ni Gomen Ne)
00:00.473: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Hatsune Miku - The Beast)
00:00.475: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Hatsune Miku - Time Machine)
00:00.476: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kagamine Len & Kagamine Rin - Hakobako Player)
00:00.477: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kagamine Len & Kagamine Rin - SiGrE)
00:00.478: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kagamine Len & Kagamine Rin - Yokkora Sex)
00:00.480: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kagamine Len - Fire Flower)
00:00.481: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kagamine Rin - Dog Day Afternoon)
00:00.484: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kaito & Meiko- Tsugai Kogarashi)
00:00.485: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kaito - Pane Dhiria)
00:00.486: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kamui Gakupo & Megurine Luka - Gugurekasu)
00:00.488: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kamui Gakupo - Breathe)
00:00.489: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kamui Gakupo - Bushidou Romantica)
00:00.490: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kamui Gakupo - Nishiki No Mai)
00:00.492: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Merm D] Kamui Gakupo - Tougen Uta)
00:00.493: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Nanaki BH] Hatsune Miku - Secret Police)
00:00.494: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[NBH] GUMI - Life Reset Button)
00:00.495: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[NBH] senbonzakura)
00:00.497: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[nekoray] Gumi & Hatsune Miku - Matryoshka)
00:00.499: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[nekoray] Hatsune Miku & Namine Ritsu - Chain Girl)
00:00.500: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[notyourgoat] Hatsune Miku - Celluloid (PRhythmatiq Remix))
00:00.504: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[notyourgoat] Hatsune Miku - More Like You, Less Like Me)
00:00.505: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[notyourgoat] Hatsune Miku - Sin & Punishment)
00:00.507: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[notyourgoat] Kamui Gakupo - Stargazer)
00:00.508: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[SoleSM] Kasane Teto - Ochame Kinou)
00:00.509: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[StarCharm] Hatsune Miku - Tell Your World)
00:00.511: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[StarCharm] Kagamine Len & Kagamine Rin - Revolution)
00:00.512: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[StarCharm] Kagamine Len & Kasane Teto - Barrage Button)
00:00.513: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[StarCharm] Kagamine Len - The Riddle Solver Who Can't Solve Riddles)
00:00.515: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[StarCharm] Various - Honey)
00:00.517: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Stepmania] Holy Knight)
00:00.518: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Sugarymoon] Kaito - Japanese Banquet Song)
00:00.519: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[T0rQu3] Hatsune Miku - Melody.exe)
00:00.521: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_[Vendice] Hatsune Miku - Subarashiki Shin Sekai)
00:00.522: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Ah, It's a Wonderful Cat Life)
00:00.524: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Anti the Holic)
00:00.525: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Astro Troopers)
00:00.527: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Butterfly On Your Right Shoulder)
00:00.529: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Caramelldansen (Speedycake Remix) (kjwkjw))
00:00.530: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Chaining Intention)
00:00.532: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Chaoz Airflow)
00:00.534: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Chaoz Fantasy)
00:00.536: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Do You Like Waffles (kjwkjw))
00:00.537: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Equation+)
00:00.539: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Five Nights at Freddy's Song)
00:00.545: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Goin' Under)
00:00.546: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Harvest)
00:00.547: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku & Kagamine Rin - Kichin To Chicken)
00:00.549: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku & Megurine Luka - Magnet)
00:00.551: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Alice Human Sacrifice(Mecha Miku Mix))
00:00.553: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Black Rock Shooter)
00:00.555: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Cinderella Romance)
00:00.556: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Hello Planet)
00:00.558: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Ievan Polkka)
00:00.559: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Love Is War)
00:00.561: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Miku Miku Ni Shite Ageru)
00:00.563: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Popipo)
00:00.564: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Popipo(Touhou PV))
00:00.568: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Take It Easy!)
00:00.570: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - The Disappearance of Hatsune Miku)
00:00.572: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Triangle Girl's Heart)
00:00.573: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Triple Baka(feat. Akita Neru & Kasane Teto))
00:00.575: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - Two-Faced Lovers)
00:00.577: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - We Are Pop Candy)
00:00.578: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku - World is Mine)
00:00.580: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hatsune Miku's Head Exercises)
00:00.582: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Hope for Azure Sky)
00:00.584: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Ievan Polkka)
00:00.586: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Imagination Forest)
00:00.587: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Len - Presentiment Of Storm)
00:00.589: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Len - SPICE!)
00:00.590: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Rin & Len - Adolescence)
00:00.592: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Rin & Len - Trick & Treat)
00:00.593: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Rin - Harvest)
00:00.595: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Rin - Love Is War(R184mm Remix))
00:00.597: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagamine Rin - Mille Feuille)
00:00.598: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kagerou Days)
00:00.601: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Kamui Gakupo - Dancing Samurai)
00:00.602: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Livin la Vida Loca)
00:00.603: Song "/Songs/StepMania 5/Livin la Vida Loca/" has no music file; guessing at 100.000000 seconds
00:00.604: Song "/Songs/StepMania 5/Livin la Vida Loca/" has no music; ignored.
00:00.604: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Love Sick -Exhaust-)
00:00.606: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Love_Philosophia.sm)
00:00.609: Loading notes from /Songs/StepMania 5/Love_Philosophia.sm/Love_Philosophia.sm.ssc
00:00.610: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Luka Luka Night Fever)
00:00.612: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_M2U - Masquerade-1)
00:00.613: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Matryoshka)
00:00.616: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_MechaTribe Assault)
00:00.618: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Megurine Luka - Japanese Ninja No.1)
00:00.620: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Megurine Luka - Rip=Release)
00:00.621: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Meltdown)
00:00.623: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Necrofantasia)
00:00.624: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Night of Nights (0))
00:00.625: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Po pi po)
00:00.627: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Po Pi Po (Ryu Remix))
00:00.628: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Rolling Girl)
00:00.630: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Six Trillion Years and Overnight Story)
00:00.632: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Springtime)
00:00.634: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Still Alive)
00:00.635: Song "/Songs/StepMania 5/Still Alive/" has no music file; guessing at 100.000000 seconds
00:00.635: Song "/Songs/StepMania 5/Still Alive/" has no music; ignored.
00:00.635: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_The Disappearance of Hatsune Miku)
00:00.638: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Trick & Treat)
00:00.640: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Triple Baka)
00:00.642: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_Two-Faced Lovers)
00:00.643: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_World is Mine)
00:00.645: Song::LoadFromSSCFile(Cache/Songs/Songs_StepMania 5_World's End Dancehall)
00:00.646: Loaded 170 songs from "Songs/StepMania 5"
00:00.646: Found 170 songs in 0.293755 seconds.
00:00.646: Loading courses.
00:00.647: CourseLoaderCRS::LoadFromCRSFile("/Courses/Default/ChallengingRandom5.crs") ("Cache/Courses/Courses_Default_ChallengingRandom5.crs")
00:00.650: CourseLoaderCRS::LoadFromCRSFile("/Courses/Default/Jupiter.crs") ("Cache/Courses/Courses_Default_Jupiter.crs")
00:00.651: CourseLoaderCRS::LoadFromCRSFile("/Courses/Default/MostPlayed_01-04.crs") ("Cache/Courses/Courses_Default_MostPlayed_01-04.crs")
00:00.652: CourseLoaderCRS::LoadFromCRSFile("/Courses/Default/MostPlayed_05-08.crs") ("Cache/Courses/Courses_Default_MostPlayed_05-08.crs")
00:00.652: CourseLoaderCRS::LoadFromCRSFile("/Courses/Default/MostPlayed_09-12.crs") ("Cache/Courses/Courses_Default_MostPlayed_09-12.crs")
00:00.653: CourseLoaderCRS::LoadFromCRSFile("/Courses/Default/MostPlayed_13-16.crs") ("Cache/Courses/Courses_Default_MostPlayed_13-16.crs")
00:00.656: Starting thread: Worker thread (MemoryCardWorker)
00:00.657: RageSound: Load "/Themes/_fallback/Sounds/MemoryCardManager ready.ogg" (precache: 1)
00:00.659: RageSound: Load "/Themes/_fallback/Sounds/_missing.ogg" (precache: 1)
00:00.663: RageSound: Load "/Themes/_fallback/Sounds/_missing.ogg" (precache: 1)
00:00.663: RageSound: Load "/Themes/_fallback/Sounds/MemoryCardManager disconnect.ogg" (precache: 1)
00:00.665: Starting thread: Worker thread (/@mc1int/)
00:00.666: Starting thread: Worker thread (/@mc2int/)
00:00.667: Profile::LoadAllFromDir( /Save/MachineProfile/ )
00:00.667: Loading /Save/MachineProfile/Stats.xml
00:00.667: Done.
00:00.676: UnlockManager::Load()
00:00.776: Shutting down decode thread ...
00:00.782: Decode thread shut down.
00:00.782: Mixing 1114.205933 ahead in 34 Mix() calls
00:00.790: Shutting down music start thread ...
00:00.790: Music start thread shut down.
00:00.795: Language: en
00:00.795: Theme: default


That's pretty much it. Sorry about the songs. I should have put them on after it works.

So, there doesn't appear to be any crash information in what you posted above (as far as I can see).

Is StepMania still crashing on startup for you? If so, do you have a crashlog.txt you can share with us?

This is the crashinfo.txt

StepMania v5.0 beta 4 crash report (build 7, Tue Sep 30 18:40:45 EDT 2014 @ )
--------------------------------------

Architecture: Mac OS X (i386)
Crash reason: Segmentation fault - address not mapped at 0x00000004
Crashed thread: Main thread

Checkpoints:
Thread: GUI thread
Thread: Main thread
RageSurface_Load_PNG.cpp:20
RageSurface_Load_PNG.cpp:245
RageSurface_Load_PNG.cpp:20
RageSurface_Load_PNG.cpp:20
RageSurface_Load_PNG.cpp:20
Thread: Decode thread

Thread: Main thread
9a1deff6: CFRunLoopAddObserver (CoreFoundation)
004b5775: RageSoundDriver_AU::Init()
004c7da3: RageSoundDriver::Create(StdString::CStdStr<char> const&)
000192ff: RageSoundManager::Init()
000dd9cf: SM_main
004a163b: -[SMMain startGame:]

Static log:
StepMania v5.0 beta 4
Compiled Tue Sep 30 18:40:45 EDT 2014 @ (build 7)
Log starting 2014-12-20 05:35:34
Loading window: macosx
Model: MacBookPro11,1 (4/4)
Clock speed 2.40 GHz
Mac OS X 10.10.1
Memory: 8.00 GB
WARNING: ReadFile(Save/ThemePrefs.ini): No such file or directory
Language: en
Theme: default

Partial log:
00:00.587: FlashyCombo doesn't exist, creating
00:00.587: AutoSetStyle doesn't exist, creating
00:00.587: ComboOnRolls doesn't exist, creating
00:00.587: LongFail doesn't exist, creating
00:00.587: GameplayShowStepsDisplay doesn't exist, creating
00:00.587: FancyUIBG doesn't exist, creating
00:00.587: ComboUnderField doesn't exist, creating
00:00.587: Loading "/Themes/default/Scripts/03 Gameplay.lua" ...
00:00.587: Loading "/Themes/default/Scripts/04 Other.lua" ...
00:00.656: Starting thread: Decode thread

-- End of report

Well that's interesting, the crashinfo.txt is from Beta 4 (which does not work on OS X 10.10), but the log.txt you posted says it's from Beta 4a (which should work on OS X 10.10).
I think you might have installed it wrong and be running the wrong executable.

Oh right. I see what's happened. I tried to open v5.0 b4 but it crashed. That's probably the one. I deleted all the files there and when I opened Step Mania (or tried to) the crashlog didn't come up. I have an info.txt, log.txt and userlog.txt. Despite Step Mania not opening, there is no crash log.

When I try open it it loads but then the icon on my dock disappears and it's not there anymore.