Loading certain Omnisphere patches causes this problem, as does enabling an instrument track with an Omnisphere patch that had previously been disabled. The performance meter then freezes like this:
Playback can be started, however there is no sound no matter what is done within the project. The only solution is to force quit Cubase (normal quit does not work).
This has been happening for a while now. The problem is not limited to Cubase 10.5.20, previous versions of Cubase also suffered from this problem.
I’m using the latest versions of Omnisphere & Cubase, macOS Catalina 10.15.3 on a 2019 Mac Pro. But the versions/specs really don’t matter much in this case as its been happening for years.
Enabling/disabling “suspend VST 3 processing” does not make a difference, deleting prefs also does not.