Preview Panel Doesn't Update

Every now and then the Preview panel will not reflect the changes I am making and stay static? Don’t see a pattern on how this happens yet

I’ve noticed this stops working after a revert, it stops responding to anything. Only changes when I close the preview and re-open, but does not update on the fly. Must restart glyphs to fix.

that happens if it is stuck and you open a new tab?

I noticed the same. Sometimes it simply will not update. Usually slightly resizing the preview triggers the update. Sometimes undo/redo does the trick. Sometimes switching to the Font tab and back helps. Sometimes a Glyphs restart is necessary.

854 / OS 10.11.5
The same problem if select an instance.

Switching to another master and back works

Don’t work for me.