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,
--
Darius
