Alt Tab not always in front? RC 7100

Ok. Tried playing around with the "DesktopLivePreviewHoverTime" settings. Here's what I found. If I change the setting to change the time, when I reboot, I get the behavior I expect from alt tab, that is, the alt tab window stays in front and, as I switch windows, the highlighted window will Peek.
It stays this way for maybe 30 seconds, then, goes back to the old behavior where the alt tab window fades to the back.
Obviously, this behavior is somehow related to Desktop Hover Time registry entry. Any other help would be muchly appreciated.

Now I am reporting some more strange behavior. I reported to you all yesterday that it is now working as expected with the icons staying on top, but not due to anything I did. Then later that day, I noticed the behavior reverted to the undesirable behavior where the icons were hidden behind the Peek window. Now it's reverted back again to the correct behavior. There have been no reboots, logouts, or registry changes during this period.

There seems to be some randomness to the behavior.

I noticed that I did not have the Alt-Tab problem if I logged in with a different account. I logged in as an admin and deleted my profile (My Computer|Properties|Advanced System Settings|User Profiles|Settings). I logged back in and don't have the alt-tab problem anymore. You will end up losing a lot of your settings and don't forget to back up your desktop and Favorites, but, it works.
I would like to hear if this fixes the problem for anyone else.