I can't roll-back either. Had to uninstall MBytes for the time being. Monitoring this thread and other forums until I can download an updated version.
The latest version of Malwarebytes Home seems to be incompatible with the Windows 10 Insider Preview Build (18323-19H1). All services except Exploit Protection are turned off and you can't turn them back on. Restart does nothing. Uninstall hangs until one of the Malwarebytes processes is manually terminated. Re-install works then the services turn themselves off again seconds later. Anyone else having this issue?