Calling functions to clear cache has not been helping. I followed your advice in previous replies, but the texture that comes with the cube demo still has black blocks in it and corrupt text after swizzling. I have no other textures loaded and no other objects other than the cube right now, so I don't see what else can be causing the problem.
If you would be willing to look at my code I'd be happy to upload it all.
Thanks for your continued efforts.