Lightmapps problems in 3.5

Hi everyone! i just installed 3.5 and i find a really bad problem with lightmaps.

They look really bad in unity, with a weird gradient, but if i check the texture in Photoshop, it looks smooth and fine.

what could be? is anyone experiencing this problem too?

Thanks!!

Lightmapping->Maps-> disable compression

Thank you!! i knew that it should be something related to compresion (in UDK happen something similar).

Thank´s!!