I am using an iMac, late 2013, updated to macOS Catalina today. When opening Rhino or RhinoWIP, right when creating a new file or an existing one it crashes. On another, newer Mac it starts perfectly fine. I am not sure if it has to do with the age of the computer, as the error suggest some bug with auto layout. The whole crash is due to “The window has been marked as needing another Update Constraints in Window pass, but it has already had more Update Constraints in Window passes than there are views in the window”. I sent all bug reports directly, just trying to create a thread for possible fixes and to help other people with the same issue 
Ah, just saw there is an existing thread under Rhino6 won't work after update to Mac OS Catalina This can be deleted here then
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