Well, the best you can do is to file a detailed bug report. They don't refer to a CC subscription as membership in the Adobe Unpaid Beta Tester Program for nothin', y'know.
Are you using any GPU accelerated effects?
I have consistently had this exact same problem for many months now. It is VERY annoying and unprofessional to have in final videos.
It only affects my video file layers (the video file will go black for a single frame, but the other layers will not).
This happens in the project window, in the source window – even though the original file when played outside AE does not contain the black frame.
It is very common and seems to not be consistent when it will show up, but does so several times per video.
I have gotten on with Adobe customer support chat twice just tonight! Both times, they removed any third party plugins, cleared preferences, and caches. Both times the problem came back shortly after closing the chat.
I am on a 27" 5k iMac running latest osX and the lastest CC.
Btw, I think when I just cleared my cache, it stopped showing the frames for a bit. Eventually, it comes back but at least its a temporary fix so you can render them out without any black frames.
My cache is 100GB btw.
Adobe, please fix this.
This has been happening to me as well. iMac Pro, AE 15.1.2