Songs w/lua can't open in edit

Oh, derp, I didn't notice the dot in front of stepmania!
Anyway, everything seemed normal in the log until I got to this:

02:45.069: TEXTUREMAN LEAK: '/Songs/DAT PACK DOEE/SPACE/YDVCD.png', RefCount = 26.

02:45.070: TEXTUREMAN LEAK: '/Themes/default/Graphics/Common fallback banner.png', RefCount = 1.

02:45.070: TEXTUREMAN LEAK: '/Themes/default/Graphics/StreamDisplay hot.png', RefCount = 48.

02:45.070: TEXTUREMAN LEAK: '/Themes/default/Graphics/StreamDisplay normal.png', RefCount = 96.

That's the file I was trying to open. Not sure what "TEXTUREMAN LEAK" means.

I think you cut out too much of the log. Texture leaks (textures still referenced when the game exits or changes screens) wouldn't cause a crash in this case.
Sometimes log.txt doesn't have anything useful in it because the game crashed before it was written to. Check /tmp/crashinfo.txt if it exists, it should have a call stack and hopefully some other useful info.

No /tmp/crashinfo.txt.
But this looks important:

02:44.704: gluBuild2DMipmaps (format GL_RGB5_A1, 1024x512, format GL_RGBA, type GL_UNSIGNED_SHORT_5_5_5_1, pixfmt 3, imgpixfmt 3)

02:44.776: RageBitmapTexture: Loaded '/Songs/WinDEU Hates You 5EVR/Bad Maniacs/bg.png' (1024x512); RGB5A1 opaque dither, source 640,480;  image 640,480.

02:44.776: Performing texture garbage collection.

02:44.777: 

02:44.777: //////////////////////////////////////////////////////

02:44.777: Exception: Fatal I/O error communicating with X server.

02:44.777: //////////////////////////////////////////////////////

02:44.777: 

02:44.777: Shutting down decode thread ...

02:44.784: Decode thread shut down.

02:44.785: Mixing 0.000000 ahead in 0 Mix() calls

02:44.785: ScreenManager::~ScreenManager()

I wonder what the I/O error was...

I just compiled SM5 Beta 3, and I can open the file now. Thanks for all your help up to here!

I just compiled SM5 Beta 3, and I can open the file now. Thanks for all your help up to here!