Hey, so randomly the right side of my screen will be cut off... like i can see my desktop but the windows wont go past it...
im on win7 x64 (i had the same problem in vista) with a raedon x1550
rebooting fixes it, mi not sure what causes it.
any ideas?

picture attached

What DPI scaling setting do you have? If it's not the standard 96dpi perhaps you could try that setting.

Also, if you turn Aero off does the phenomenon go away?

Looks like something that is supposed to be docked there is having issues. If this was Vista I'd say maybe you had the sidebar up but nothing in it. Can you right click in the blank area by any chance?

commented: nice catch! +2

actually your right, it was an im program called pidgin, not sure why...