Hi Larry, so the way the Mac trackpad works is that a 2 finger pan gesture is actually sent as a scroll wheel type event. So then MoI needs to do some stuff to figure out if it's coming from a 2 finger trackpad gesture to do panning or if it's coming from an actual mouse wheel which does zooming.

So when it gets stuck doing zooming it probably means that the method used to determine if it's a trackpad event is not working anymore. It's odd that it gets stuck like that, probably some kind of OS bug. I'll investigate.

- Michael