Dorico 4.0.3 Mixer Inserts not working

Upgraded to 4.0.3 and the Inserts in the mixer are not showing up any more. If I click on an insert slot, the list of VST FX plugins does not come up. The VST instruments do work fine in the PLAY window.
I was able via TimeMachine on my Mac to get 4.0.2 back again, and that works as normal, as does 3.5.
I have attached a diagnostic from 4.0.3 in case that is any use. I also went to the VST plugins section in the preferences and allowed all blocked plugins. Clicking on ‘Clear Audio Engine Cache’ does not do anything. I’ve also tried shutting down and restarting etc, but the inserts are somehow broken on my system.
Dorico (2.2 MB)

Please see this earlier thread: