Many of my previously working AUv3 insert effects have stopped loading since the most recent Dorico for iPad update. Rhino and Mammoth in particular. (Guitar and Bass amp sims)
In the Preferences dialog, can you check that your status still shows an active subscription or the Lifetime Unlock?
Confirmed, still shows Lifetime Unlock.
Apologies it seems the problem was only with the Rhino AUv3. Having the faulty Rhino AUv3 loaded seemed to stop other AUv3’s loading. Rhino had an update today and is now working again to some extent (UI scaling issues are now present).
Great, I’m glad to hear you have a handle on the issue.