Importing OBJ file works on Mac, but same file has messed up textures on Windows

Hi,

So I have an OBJ file with multiple textures. When I import it into Unity on Mac OS X everything is good. it looks fine.

I take the same file and try to import it into Unity on Windows. The mesh seems fine, but the textures are completely messed up. It looks like they are in the wrong place.

I tried a few things from searching the net that didn't help. I tried checking Swap UVs when importing. I tried changing all the materials from Repeat to Clamp. Neither helped.

I can't figure out what could be causing this. The folder/file hierarchy is identical (I just copied the entire folder over).

Really stumped. Does anyone out there have any ideas on what could be going on ?

Thanks, Layla