When I log into Citrix from my laptop with 10.04, and click on the windows RDP app to launch, and select full screen, it only fills in between the gnome panels, and adds scroll bars. This does not work well at all. And I'd love to get a fix (as a work around I tell citrix to use a full-screen session, not seamless, and this works as expected, but has it's own usability problems)
Logging in on my desktop with Ubuntu 10.04, full screen works correctly. The only difference between the computers is the laptop has intel graphics and the desktop nvidia.