P: Zooming not working in the map module, using the two-finger up/down or scroll wheel

Zooming doesn't seem to be working for me in the map module, using the two fingered up/down gesture on my MacBook Pro's trackpad.  I've been offline due a corrupted disk for a few weeks and had to restore my Mac from a TimeMachine backup, and now zooming's not working.  It used to work, and it still works in Google Maps in my browser.  Is this configurable somewhere, or could there be a problem with either Lightroom or some change Google's done on the backend that's affecting the map module?  It's really frustrating because all the alternatives are incredibly slow and clunky in comparision, and I've got a lot of muscle memory using gestures.