[Hugh]

Looks like this only impacts the two page display mode. It works correctly with every other display mode. I'll work on getting a fix in place.

Thanks,
Mike

No, I never use two page display. For me, it happens on everything. However, I have found a better workaround, that almost totally obviates the problem: do a two finger zoom then pan with one or two fingers before entering annotation mode. Then choose an annotation tool. 
As long as I don't un-zoom all the way, the zoom and pan tool works. 
It seems to latch onto zero zoom if allowed to! 
I'm fine with my workaround, which may actually be a better method! How do other users approach zooming to maximum to do pen annotations?

Hugh