sorry.. I should have tested this a bit more before giving you tests.. I thought it wouldnt work..

I did it my self and it worked..

but the errors I get when I bake a lightmap then bring it to maya and load it to a unconnected filenode and bake again and bang baking fails..

could you please try it

there is something weird going on..
Im using xp 64bit ..might that be the problem?

Wow this was the first site where I got some real answers!
thanks anyway

and I havent had any problems before using same texture in maya and photoshop at the same time (I used before maya6.. I know it was old but worked fine)