Is there some forum or bugtracker around to mention issues with DaVinci Resolve (PRO)?
here's one since DaVinci 18+ which wasn't there before:
Once in a while, no clue when, suddenly some half UI panel appears on random positions on the screen. Like this one, right above the viewport in the Fusion page. No clue how to get rid of it and there seems to be no option than to restart the software.

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Davinci Resolve 18.0.1-build-3 (PRO)