Sounds like the problem i sometimes got in fs9 when the textures had mip maps. Try zooming all the way in then back out, if that doesnt work then check to see if the texture has mip maps, if it has then just re save the textures with painting prog or dxtbmp with "has mitmaps" (or something simular) disabled. :wave:
Edit = looks like Chris beat me to it
Edit = looks like Chris beat me to it