Textures do not display properly in the current game engine. I don't know wether it's because of my graphic card (ATI Radeon X1900 xtx) or a blender bug? I didn't notice that previously.
yes, it is your graphics card. It is not a blender bug
in whatever ati's graphics option tool is now [or you have installed], play with the texture quality setting [turn it up, higher quality, lower performance]