Layers Stacking upon Revisit

There have been a few posts recently about problems with layers. 

In one reply from 2 hours ago, Eric says they just released an update that fixes the problem. So try updating to today's version. (If that doesn't help, try reverting to a previous version when it worked.)

Here's the post with that reply:  

Storyline issue – Layer not persisting during review since recent updates | E-Learning Heroes