Using Mac devprev I just updated this morning and see unusual behavior I've never seen before.
I started new puzzle, 751, and turned on View:Show bonds. Then ran a script (Tvdl DRW). During run I turned off View:Show bonds. Here's the strange behavior:
The script continues to run and every now and then the protein flashes a view with View: Show bonds turned on again. It is as though a screen refresh memory has not been updated.