When I highlight a variable in VS2010 and right click to choose QuickWatch, the QuickWatch window does not appear. VS behaves as though the modal window is open and keeps me from doing anything until I hit "Cancel".
A coworker suggested that I go to the Window menu and choose Reset Windows Layout but that didn't help either.
BTW, I am running on Windows XP.
Try opening the Quickwatch window (Shift+F9 by default), then press Alt, then press twice on the Down key. finally press the Enter button.
This should activate the move action for the window. Now try playing with the arrow keys, or with your mouse.