Hi David,
Until you posted your message, I hadn't noticed this problem. I just opened the catalog star generator, and the dialog boxes look exactly the same as yours. I also use a MacBook Pro, Retina. My system is 10.9.5. Judging from the thread that is tabulating users by type of OS, there are a lot of MacBook owners who use PixInsight and who must be in the same boat. I hope that some genius will notice this thread and pass along a solution.
Russ Carpenter