Suddenly started crashing - mono-sgen pthread_mutex_lock.c

Any chance Python 2 was removed? The updated to Python 3 occurred for both users and the timing fits.

Possibly similar (but certainly a different manifestation) to what has happened with MacOS after 12.3.

@jimkd1yv your issue has been escalated to the top of the forms list (for the moment), which is as good as it gets BTW.