When I start Cogs the Logo appears, and then the screen stays black.

When looking at the console output the following lines appear suspicious:

Shader compile log for data/effects/TextureBumpCubemap.fsh:
Fragment shader failed to compile with the following errors:
ERROR: 0:41: error(#132) Syntax error: 'smooth' parse error
ERROR: error(#273) 1 compilation errors.  No code generated


It seems that smooth may be a keyword or something like that (maybe only my driver, fglrx?). Since when I replace smooth with something else, i.e. smoother
the game works.

The following patch fixes the issue for me:

--- TextureBumpCubemap.fsh      2011-07-26 21:53:45.475304298 +0200
+++ TextureBumpCubemap.fsh_new  2011-07-26 21:53:45.508303520 +0200
@@ -38,8 +38,8 @@
     //** normal and a "bumped" normal.  Note that this "flat"
     //** normal is based on the texture space coordinate basis.
     //**--------------------------------------------------------
-    vec3 smooth = vec3(0.5, 0.5, 1.0);
-    fvNormal = smooth*(1.0-bumpiness) + fvNormal*bumpiness;  //lerp( smooth, fvNormal, bumpiness );
+    vec3 smoother = vec3(0.5, 0.5, 1.0);
+    fvNormal = smoother*(1.0-bumpiness) + fvNormal*bumpiness;  //lerp( smoother, fvNormal, bumpiness );
     fvNormal = normalize( ( fvNormal * 2.0 ) - 1.0 );
     
     //**---------------------------------------------