The flipbook playback preview plays at super-speed unless vSync is enabled under Settings/Preferences.
Also, the Playback Frame Rate setting under Playback Control seems to have no effect at all whether vSync is enabled or not.
This is a known bug, we hope to have it fixed when we introduce retiming and re-write our export code next year after our vacation.
Sounds good. I will just enable vSync. It’s not really a problem in that regard.