Multicam Program View not working - forces restart

Using beta 22.3.0.33 on Windows 10 18363.2037

Nvidia driver version 511.65 on a P4000

When toggling to the multicam preview window, the program viewer then ceases to function until a restart (shows a blank / grey(?) screen anywhere in the timeline)

Multicam sequence can still be manually edited

NOTE: sometimes unselecting multicam preview seems to fix the program window? so a restart might not always be required - will update if more consistency is found