some more info :

the problem is that i can control the macpro, the mouse is doing what's it supposed to do but on the control window from remote desktop on the macbook the mouse doesnt appear and i cant open any windows,... . Sometimes the mouse moves behind the control window but is still working on the macpro. Sometimes it works at startup, not a lot, and if it does when i move the colour scroller it stops working...

Now for the second time when i leave the macbook and the screensaver start and i press spacebar to acces remote desktop it works... and when i moved the colour scroller it does the same thing as described... But the 3th time i've tried that it didnt work.