[Jedediah Gildersleeve]

I’m not sure if you guys are referring to a constant flickering (like every other frame) or intermittent full screen green flashes. I’m cutting a large green screen project and I’ve been experiencing both.
Constant Flickering:
First sequence that I cut I was getting constant flickering and it seemed to get worse if I had more than one video effect (i.e. levels, contrast, CC). I reduced my effects down to just one and then increased Temporal Smoothing to 5 sec. Any less than that and I still saw the flicker. Not a great solution but seemed to be working at least.
Intermittent Full Screen Green Flashes:
Same footage, different sequence. All of the sudden I started getting the full screen green flashes. OMG! I went into PP Preferences>Memory>Optimize rendering for… and switched it from performance to memory. I also allocated 13GB of my RAM to PP and only 3 GB for other apps. This seemed to work. No more flickering or green flashes. I even tried reducing temporal smoothing from 5 sec to 0 sec and it still worked.
Oh yeah, I’m on a MAC Powerbook, 2.3 GHz Intel Core i7, 16 GB 1600 MHz DDR3, OS X 10.9.5.
Good luck!