okay, I've found the problem. I've accidentally ticked a "show visual
system bell" and "flash the whole screen" in the sound-dialog under the
settings menu. Embarrassing. Thank you for your time.

Maybe you could add a "show"-button to show how it'll look?

Changing to Invalid.

** Changed in: Ubuntu
       Status: New => Invalid

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screen flashing black at certian points
https://bugs.launchpad.net/bugs/122598
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