I am getting the same exact error!
I would like to start with “Clip B” in the 2 up display. I also have set sync to “Open”
With Viewer selected and “Clip B” selected I press play and only “Clip B” rolls playback. The canvas window is stuck on the first frame from where I started playback. With playback still rolling I click “Clip A” and then playback stops.
If I select the canvas and press play the canvas rolls and the multi-clip (viewer) frames are frozen.
Some how when I get frustrated and just start clicking things here and there it starts working. I don’t know the pattern of how to get it working again. Sometimes it does sometimes it doesn’t.
However I cannot “undo” any of cuts made by clicking between frames. And since that happened I LOST CONTROL OF THE UNDO FUNCTION IN GENERAL! No matter what I do I can’t undo ANYTHING! What is going on here? I feel like smashing things! Are you guys experiencing anything like this?
On a side note i was wondering if anyone knows how to “heal” the separations made with the Razor blade tool without the “Undo” function.