This is on Windows 7 x64 Pro with IE9 (Updated Beta1)

If you have a webpage maximized and point/click/and hold the mouse on the top edge of webpage, the webpage will resize. Often it will also identify the monitor. If you click and hold on the Red X in the upper right corner, it will Identify the monitor. If DF is closed down, this does not happen.

I had this happen today on my Win7 x64 system and I am not running IE 9. I am running some strange corporate applications, however.

I was using DF Beta 10 at the time.

I didn't get the resize, I did get the monitor identify when I was attempting to close some app (don't remember which one).