it should work. the first problem sounds like a bug. if you can't solve it you should ask jcl.

try to use a smaller cube. some cards don't support cubes with 512x512 sides for cube mapping.

Strange! I'm using a 256x256 cubemap but still strange things happen. Here is one side of the cubemap (the rest is exactly the same):


And this is the result:


Can't be! Anyway cubemapping works with all commercial games so I'm sure my card supports it.

it's perfectly normal that cubic environment mapping is distorted on this cube! it's the way it works. cubic environment mapping will only look good on rounder objects with more polygons.

...
if you want to have better cubic environment mapping on cubes or other objects with flat surfaces, you have to make the edges hard (split the vertices so that there isn't only one averaged normal) and you have to use a shader which calculates the view vector per vertex.

uhm, well...okay. I'll have to use it this way then. thx