https://bugs.kde.org/show_bug.cgi?id=367534

--- Comment #7 from Thomas Lübking <thomas.luebk...@gmail.com> ---
This is not a kwin bug, but please attach the output of glxinfo (to provide a
hint on why compositing may fail)

There's most likely a window (the dialog?) with uninitialized content which
also doesn't update for exposure events and by this accumulates everything the
server ever displayed in its area.
Whatever client provides this window is likely "frozen" (taken by something)

For a wild guess, try setting the system language to english.

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