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Exactly the same for me as well (catalina), only started to happen after the latest update so 100% a major bug that needs sorting out. I'm running...
Tried but that failed too - however support came back to me, told me to use the Stop menu item to kill the machine then restart it - after that it...
I've got the same problem - upgraded and now get a black screen - cant do jack with it now - reinstalled, tried the modularity tick box on/off and...
Same here i'm afraid and it's costing me a lot of money in lost time. I've seen this process hitting over 200% on my MBP 8Gig ram etc Windows 7...