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