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followup by OP: it has been escalated through tier 1, and tier 2 of support, and is now sent to Development. A workaround is to change the...
yesterday I did file a support request and was assisted to try boot option unsuccessfully; then to revert to the latest version 20 with a...
followup by OP: today I "reverted"; downloaded Parallels 18.3.3 and installed. That fixed my problem - now the virtual machine starts perfectly....
This is a long established VM, which has worked for years through multiple Mac OS, Parallels and windows version upgrades. I will attach a screen...