See 1:48 https://www.youtube.com/watch?v=fZ8F6erz_eM&edit=vd Reproducible: Always
Seems to happen for one virtual desktop.
Git commit 6959076bace3285dc6c79aab270b78498b1dc3dd by Marco Martin. Committed on 16/05/2014 at 14:35. Pushed by mart into branch 'master'. don't reset the desktop model when windows change many less unneeded resets and items recreation the broken tooltip was a curious sideeffect of it M +1 -1 applets/pager/plugin/pager.cpp http://commits.kde.org/plasma-desktop/6959076bace3285dc6c79aab270b78498b1dc3dd