Preview Desktop

When you move your mouse to the bottom right hand side of the taskbar, the open windows become transparent and you can see the desktop. I thought this feature was really cool and liked it a lot. I have now gotten my desktop slide-show to stick around for a lot longer than before (Still trying to get it to stay forever) but I noticed I can no longer preview the desktop by simply hovering my mouse over the bottom right hand of the screen. Preview desktop is still selected, I already tried deselecting it and selecting it again but the windows still will not become transparent like they used to. Does this feature disable when you have the desktop slide-show enabled? Can anyone shed some light on this?

No I have a custom aero theme with completely transparent borders. I have a background set now (No slide-show) but it still won't work. dwm is running..

The only visual settings I have disabled are:
Animate controls and elements inside windows
Animate windows when minimizing and maximizing
Save taskbar thumbnail previews
Show shadows under mouse pointer
Show translucent selection rectangle (Which is BS because in explorer the selection rectangle is still the blue translucent, not the simple dotted lines)

My WEI score is 3.0 (My hard drive sucks apparently?)
Processor 4.9
RAM 5.3
Graphics 4.9
Gaming graphics 4.5

Like I said it was working before, and now I noticed it's not working anymore. I don't know exactly when it stopped working or why.

Yea that fixed it, I'll update this post when I figure out which one it is.

Yea its the animate controls and elements inside windows.

Which SUCKS, because I hate the little white squares that are shown when copying/deleting/moving files.

Why did they have to merge the preview desktop into there!?

On my system it is " Enable Desktop Composition " which also turns
off the transparency.

Thanks for the help, This thing was driving me nuts!

Richard