When I run a fullscreen app that is in a lower resolution than my desktop, my out-of-fences-icons get disorganized like I changed my desktop for this resolution and then changed it back for a higher one.
A better example:
1. My desktop is 1280x1024.
2. I run "Tomb Raider: Underworld" or "The Sims 3" in 1024x768 fullscreen.
3. I close the fullscreen game I was playing.
4. My out-of-fences desktop icons get disorganized in a kind of "1024x768 area" at the left upper corner of the screen like I changed it to this lower resolution and then changed it back to 1280x1024.
Windows 7 Ultimate 64-bit.