Comment # 10 on bug 1176229 from Wolfgang Bauer

(In reply to Dirk S. from comment #9)
> Yes that is correct: It works fine with OpenGLIsUnsafe=false.
> I am using the nouveau graphics device driver.

Do you have Mesa-dri-nouveau installed?

If everything works with OpenGLIsUnsafe=false, then you should be fine though.
This should only get set to true if kwin crashed for some reason (and it means
that it won't try to use OpenGL anymore).

Strange that it would crash if it is true though.

Can you still reproduce the crash if you set it back to true?
If yes, please post the output in konsole (as already asked), and/or the crash
backtrace (you should get a crash dialog if it crashes).