Yesterday, a strange thing happened. One of the songs I'm working on has 3 VEP RTAS plugins instantiated in Pro Tools. One 64-bit, and two 32-bit. On the slave, all 3 instances opened up with all the correct plugins and settings, but PT didn't see the second 32-bit instance. All MIDI outs and Aux inputs were greyed out and in italics. All three plugins said Connected. Tried several reboots of both Macs, but it didn't help.
So, I had to manually re-route the audio inputs and MIDI outs in PT. That fixed the routing, but some of the audio coming from the slave were totally out of sync. Specifically, all Stylus RMX and Maschine plugins played out of sync, but none of them were in the aforementioned 32-bit instance. I saved the session (all coupled, not preserved), quit PT and VEP Server and rebooted both machines. Didn't help - still out of sync. Then I tried to open the session, preserve all 3 instances, and only reboot the master Mac. That fixed it!
I have no idea why this happened, but I sure would love to avoid this in the future. Thanks.