I have a similar issue when working on Multicam view.
For example, if i use Roll Edit while the clip is playing, everything starts to fliker big time.
The solution is to stop playing, then disengage and re-engage Multicamera View (Shift + 0)
Never had that type of problem in cs5.5 and cs6 , and i should know since i've edited more than 250 multicam videos on those.
Looks like a bug to me.