Hey, I also started having this today.
It's New Heart, episode 18, part 6
I had visited this episode yesterday and it was perfectly all right. Today I went back to correct some segments because the CM had deleted the ones I told her to, and I saw a string of microgaps (or minigaps? I sort of forgot the difference).
BUT when I run the video, it's not flashing, so they are fake. Also, they cannot be corrected. I correct them with back and forth two or three times, and yet they are still there.
Here is info about my browser (Opera 45 on Windows 7):
The following screenshot is at 150%.
They are not visible at 100% but this may be because my eyesight is not good. And I don't have anybody with good eyesight at home with me right now to check.
I realize now they cannot be viewed on the screenshot either, because it has been made smaller to fit into the thread. But you can go into Segment Timer and check.