This was happening before I installed the IE9 beta. When IE jumps to screen 1 I can't alt-shift it to screen 4. I have to click on another open program then click on IE to send it back. Once I do that, I am stuck with an IE logo on the superbar in screen 1 and when I mouse over it shows the right number of open tabs but they are all blank and clicking on them does nothing. Once I close IE the whole thing goes away.

Did you install the IE9 beta too?

I'm having this same problem as well. Also happening to Outlook 2010. I thought this was a setting somewhere since this wasn't happening with the previous build but changing all sorts of settings didn't change this behavior.

I've been having a random problem lately. Whenever ie is the active program on my screen, if I switch desktops it jumps over to it. Then if I want to send it back to the previous desktop, I have to click on another program then on ie, then alt-shift-#. After that, there is a non-functional "ghost" icon in the superbar.This happens all the time now and it's only with ie 8 and now the ie 9 beta.

Is anyone having this problem as well?