I had that problem too and I reported it (but I am unable to find the link).
If I remember well, this is what I did to solve the problem:
1/ uninstall KStars : change the name of the folder Library / Application Support / kstars, and save it to be able to restore it later.
2/ reinstall KStars with the dmg. This will create a new folder kstars in Library / Application Support /
3/ copy all the planet related files (.vsop) that you'll find in this new folder and paste them into the old kstars folder
4/ rename the saved folder to "kstars"

and here you are !

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