I haven't tested this, but I thought I should chime in that I have a Geforce 6800 and one of my demos stopped working when I had the card because one of my textures was not the same size on both axes. The texture was like 256x128, and this caused the texture not to load, and the program to crash with a memory access violation.
So apparently some or all geforce cards need textures that are square and powers of 2 in size. Either that, or there is a driver bug, or Blitz needs an update.
So apparently some or all geforce cards need textures that are square and powers of 2 in size. Either that, or there is a driver bug, or Blitz needs an update.