I have a weird situation where I show an open panel via beginSheetModalForWindow:completionHandler:. The problem is that it works OK with Mojave (and before, I assume), but it doesn't work in Catalina (10.15.1). What's weird is that, if I step through in the debugger, it appears, but if I let it continue through, it doesn't appear. My app is not sandboxed, so it shouldn't be anything to do with that.

Any ideas? I'm stumped at the moment.

John
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John Brownie
Mussau-Emira language, New Ireland Province, Papua New Guinea
Kouvola, Finland