Some time ago I upgraded a few computers in my production house to CC 2014. The new masks were cool and some other nice additional options too. But... what we soon found... there was a MAJOR bug that has been driving us nuts till today.
After rendering, some parts of video get VERY NASTY flickering along with blinking horizontal lines. It happens mostly after adding adjustment layer but it's not a rule. I would like to describe what is causing it but there seems to be no obvious pattern.
After adding effects like levels or color balance there is always a big risk of this issue.
This slows down our workflow so much that we are thinking about rolling back to CS6 which was free of this. The new fix 8.1 hasn't fixed this.
I found many editors at forums that have the same problem. What I haven't found is a solution to this.
Adobe please do something. I have NVidia cards in all workstations but I found people with other cards having the same problem.
What media are you using? In what format are you rendering/exporting? Have you tried turning the GPU acceleration off? What effects seem to be causing this flicker? Where is the media located (over a network, local RAID, USB stick)?
Are you using Shadow/Highlights by chance? There's a well known bug for years now where Shadow/Highlights sometimes causes flickering if you do it manually, particularly when there's a large area that is mostly the same color. Here's a thread covering the issue over the last 4 years (!) with no solution in sight: