Just wanted to chime in and say that this same thing is happening to me. Not sure if this will shed any light on the situation, but here are my findings:

I run two iMacs (both on Mac os 11.4) with VEPro 7. I use EW composer cloud on both machines. EW released their new Opus sample host/engine a while back. I installed Opus on one of my iMacs, but not the other. The only hangs/beach balling I get when loading are on the machine with the Opus software installed. The computer without Opus loads perfectly 100% of the time. 

EW released an opus update recently, so I'll see if that helps. Anyway, posting this here on the off chance that it helps us figure out what is causing the hang.