Client crashes upon start up with with "critical error"
When I start up the mtgo client, I receive an error message stating that there is a critical error and the client must restart. When I attempt to reopen the client, the same error comes up. I have uninstalled and reinstalled the client, but it did not fix the issue.
It sounds like you may need some more troubleshooting advice, please submit at: https://mtgo-support.wizards.com/hc/en-us/requests/new and select 'Technical Troubleshooting'.