Hi Wolfgang, thanks for replying!
KStars 3.5.9 is available for the Mac since end of May, I downloaded it from edu.kde.org/kstars/
I'm in touch with Stefano from Avalon, he confirmed me that on a Mac he found the same issue with KStars 3.5.5, so I guess it is a problem that exists since a while. If I can help you debug or test anything please approach me, I'm happy to help.
Thomas

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