Just a note, I've got the same problem, different textures, covers Australia, NZ, and anything around that region really.
Specs incase it helps.
CPU 2.6GHz
RAM 2G
Newest UFOAI (downloaded a week ago approx)
Windows XP SP2 with directX 9.0c
Video is intel G33/G31 express chipset (I'm thinking that's the problem, I will be getting a video card soon)
I've tried all the graphics options, except 3d geoscape, will give that a try now.