This issue is really bad on my system!
The moment I start playback in multicam mode, Premiere becomes completely unresponsive to any commands from the mouse or keyboard. Playback continues, both video and audio keep playing, but there is no way to switch cameras or stop playback or do anything at all. Can't even close Premiere. Minimizing and then restoring the Premiere window helps about 1 times out of 20 -- playback will then stop. Most of the times I have to force close Premiere from the Task Manager.
I tried collecting all panels on one monitor. This allowed me to edit multicam for about a day, and then the issue came back. Not sure what that means. Having all panels on one monitor seems to make the issue happen less often, but it still does happen!
Mark -- can you please send me an email too so I can send you my screenshots?
System specs:
Premiere CC 8.0.1 (21)
Windows 7 64 bit, SP1
RAM: 24 GB
CPU: Intel Xeon X5680 @ 3.33Ghz (12 threads)
VIDEO: NVIDIA Quadro 4000