Open event not firing

Latest Xojo 2.1 Catalina 15.7
I finished the project on MacOS and then decided to iron out the differences on Windows via Parallels. Up to this point I had not built for Windows. A few builds in Parallels crashed the system.
Now, while the project still runs the OPEN event of the default window no longer fires. It ignores debug breaks.
I have tried restart (including a minor Catalina update)
I have tried duplicating the Main window
Additionally Resized and Activate events do fire

Sounds like you may have a potential NSException in your application.