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The fishyness may possibly be explained because I am using macOS 10.15.4 on a MacBook Pro (17-inch, Mid 2009) via macOS Catalina Patcher (DosDude1) - essentially so I can run the current versions of author software without having to buy a new MacBook to install updates.
I know that has to do a certain amount of hocus pocus in order to cope with graphic card incompatibilities. There had been an update to the patcher in the period concerned, one element of which was a fix to certain graphics issues on some systems. That could have switched on virtual functionality that hadn't been there before?
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