https://bugs.kde.org/show_bug.cgi?id=312941

--- Comment #9 from laub <laub.blatt@gmail.com> ---
I had some sucess in tracing the problem. 
I use a mac book pro 8,2 early 2011 with an extern screen (without being able
to use the grafic card). Anyhow, when I go to Displays and mirrow them the
"missing" kate window appears again.
Then I can move it and access kate  normal. The problem reappears after a
shutdown.
However, kate is the only program which has this behavior.

@Christoph I tried deleting config files that but this did not help.

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