Roguelike found the solution to this annoying problem ; http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=523359&#Post523359

The Aigrid is saved in the wrond folder, so all you need to do is to relocate it. I just did it and it's working.
Hope Larian will patch this soon.

"You know, the very powerful and the very stupid have one thing in common: they don't alter their views to fit the facts; they alter the facts to fit their views."