From our plug-in we call IComponentHandler::restartComponent when a preset is selected (using an in-built preset system). This happens after all parameters have been set.
Sometimes, this call never returns, Cubase enters an unresponsive state, and needs to be force-quit.
I’ve no idea what might be causing this but if it’s helpful I can send a plug-in to demonstrate this (PM for details).
OS: Mac OS 10.15.4
Hardware: Mac Mini
Software: Cubase 11.0.20 Build 357