I'm actually having a similar issue and I feel like it is connected to the Lumetri effect, still testing some things. Is your flickering a strobe look or is it colors in the video flickering around?
For mine, I'm having the colors change in the footage - I added the Lumetri effect to an Adjustment Layer over the footage, set opacity to 80%. When I export the video, certain scenes flicker between the corrected color and (I believe) the uncorrected video colors (warm to greenish).
I had the issue in the past and believed that I had fixed it by changing my render settings from GPU to software only, but ever since the update it's reared it's ugly head again.
Frustrating, because my multi-day edit is stuck in a program that will not allow me to export it correctly. I'm becoming an expert beta tester
Edit: I'm exporting with the sequence settings.
Windows 7
NVidia Quadro 4000 series
CC 2014, fully updated