Copy group then select group freezes prototyper.

Chris Mockus shared this problem 3 years ago
Solved

I copied a group (actions and boxes inside) Now selecting the group causes Prototyper to freeze with the spinning pinwheel. Waiting does nothing. Force quit is the only way to deal with it. After several retries the problem remains. I can't even delete the group because I'd have to select it first. Please advise.