When dragging windows in the grid view from one desktop to another thumbnail view disappearing. This behavior is seems to affect most of the apps. Steps to reproduce: 1. open firefox(or chromium), konsole and kmail 2. toggle grid view 3. start dragging one of those apps from one desktop to another You will see that kmail thumbnail is always visible allowing you to see where you are dragging that app, while firefox and konsole thumbnails are disappearing.
What do you mean with "toggle grid view"?
(In reply to Eike Hein from comment #1) > What do you mean with "toggle grid view"? System Settings -> Desktop Behavior -> Desktop Effects -> Desktop Grid Default setting to toggle desktop grid view - Ctrl+F8
Unrelated to the Pager applet in other words, reassigning.
(In reply to Eike Hein from comment #3) > Unrelated to the Pager applet in other words, reassigning. Thanks Eike for reassigning to correct "component".
*** This bug has been marked as a duplicate of bug 364509 ***