Comment # 16 on bug 1013550 from Michael Hirmke

I tried each and everything today to track it down, and the most astonishing
fact from my original bug report is still that one:

- And a curiosity: After removing .config/plasmarc and restarting
  plasmashell the problem vanishes for a few hours or even a day, before
  it comes back.

It is reproducable.
There must be a problem with plasmahshell itself.
In my plasmarc the only entry, though is the one for the desktop theme, which
in my case is "Air openSUSE".