Comment 8 for bug 150346

I'm not sure if it is actually crashing or not and haven't yet installed those other packages you describe, but I recorded a short video that trys to explain it abit better.

I loaded Pidgin because clicking in a Guifications pop-up is the only way I've found to return back to the original desktop. So I opened a IRC channel, waited for the pop-up and then changed workspace. In the new workspace, my desktop and both panels have gone.

http://www.fileden.com/files/2006/7/4/107702/Videos/Workswitcher%20Bug.mpeg