I have just updated to P4 and have some issues - here is one: When I start Windows Vista in P4 it opens in 1440x900 minus Parallels program menues = 1439x768. In Parallels 3 it automaticly turned to the screen resolution 1440x900 using Alt+Enter key (Full screen mode). I don't want to adjust the resolution every time I start Windows, is there a fix?
Try refering to this article "Screen resolution is not changed when virtual machine is switched to full screen mode": http://kb.parallels.com/en/5765
