Desktop Video 14.4.1 update removed Mini Monitor 4K

I have a Mini Monitor 4K in a Flex8 thunderbolt chassis - ran the update to 14.4.1 and it has disappeared and is not longer recognised by Desktop Video, which is showing no cards.
I'm on a Mac with all software and OS up to date - anyone got any ideas?
I'm on a Mac with all software and OS up to date - anyone got any ideas?