Basically my plugin works now unless you pause the project (enter key) - then it goes crazy.
However if you only use the stop/start key (space bar) it all works as expected.
I can't really do anything about the pause bug until cockos fix the api bug.
Someone else confirmed it so I have reported it in the bug forum.
https://forum.cockos.com/showthread.php?t=201727
BTW I tested against the two very nice external video sync apps here below..
Video Slave (which has some great ADR features)
https://non-lethal-applications.com/.../video-slave-3
Mitti
https://imimot.com/mitti/