I just bought the pro version and I am having display issues. If I have a window open (program window or directory) and move the window, whatever was behind it will only be partially displayed. I had outlook open and moved a window that was in front of outlook, and the upper left corne of outlook was just blank white (this was 1/4 of the screen on a 22" display that was blank).

I am running Windows 7 Pro SP1 with 8gb ram.
My df version is 5.1.

Thanks,
Don

Googling the problems shows it's common in W7. I get it occasionally.

Try here for starters:
http://www.sevenforums.com/graphic-cards/134717-display-issues-screen-refresh-problem.html