Version: (using Devel) OS: Linux Installed from: Compiled sources When you click on any plasmoid that slides a window from the panel, it doesn't unfold completely, leaving the screen dirty near the panel. This wasn't happening with the panel at the bottom of the screen. See the screenshot.
Created attachment 40422 [details] After closing
I guess that you are using Desktop Effects and that this bug should be bug 215400 Regards
*** This bug has been marked as a duplicate of bug 215400 ***