I've sent you a private message with an invitation to send me your logs off-forum.  Please let me know if you've received it!

My generic initial troubleshooting questions would be: (1) What's the nature of the crash, or at least an error message?  (2) Does it go away if you downgrade to Workstation 12.5.5 again?  (3) What's your host OS (including kernel/version/build number)?

Cheers,

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Darius