[quote=456487:@Richard Nicolella]SelectColor can only be used once on Catalina. The second time the app will blink out of existence.
I entered a Feedback case on August 3, 2019. The Catalina GM is out today and it still crashes. My app uses SelectColor heavily and will now be worthless in Catalina.
Can anyone suggest a workaound?[/quote]
This issue has been fixed in the next version of Xojo. If you need something sooner, you’ll need to use declares.