OSX 10.15.6 issues with V collection plug-ins in Mainstage 3?

[tedh]

Hi -MBP updated to OSX 10.15.6 yesterday and now Mainstage 3 freezes every few seconds.  I uninstalled all Arturia plugins, have rebooted a number of times, reinstalled, and it's still an issue.

Any tips or solutions?  many thanks.