I can reproduce it on some videos, not on all of them. But there seems to be some z-index fighting going on between the ambient light and the video. The fix seems to be to apply a z-index of -1 on the ambientlight class. I'll push an update.

Update: Version 2.37.32 has been published. Let me know if it has been fixed.

EDIT: Good to know that it has been resolved correctly. You're welcome!