2024.6- CPU overloads when stopping transport

[Marsdy]

My super-stable system is no more following installation of 2024.6.

In my composing template and every session based on it - there are getting on for 200 tracks - mostly Instrument Tracks fed from VE Pro.

Whenever I hit stop - there’s a massive 100% CPU overload on every core which lasts a good few seconds and PT is unresponsive. During the overload, the MIDI activity monitor on every channel within VE Pro goes crazy although I can’t hear anything fortunately!

I’ve done much troubleshooting including deleting PT prefs twice with PT Prefs 2. I’ve deleted VE Pro prefs and also re-installed it. I’ve also uninstalled every new plugin I’ve added in the last few weeks. Everything is at the current version.

So far - I’ve concluded it’s related to FabFilter Pro Q-3. I have it on every track in my template. If I make every Q-3 instance inactive - the problem goes away. If I replace Pro Q-3 with the Avid EQ III 7 band - the problem goes away. Previous to 2024.6, there wasn’t an issue. I’ve also turned MIDI off in every instance of Pro Q-3. If I make inactive the five instances of VE Pro in the session, again the CPU overs stop.

I’ve been working on two other sessions with no VE Pro but lots of Pro Q-3 instances with no problems.

Any ideas?