I did above:
Things are working again, though all of my devices are dupilcated - I have them all assigned to rooms in GH, and also a duplicate set of them unassigned to rooms. I’d like to just delete the unassinged devices, that the right approach?
EDIT: My bad, appears I probably don’t have a bunch of duplicates, just a bunch of devices that aren’t assigned to rooms so they initially looked like duplicates. I haven’t gone into GH in a while to review devices so for all I can remember I’m not sure if I ever placed all those devices in a room. Going to spend a little time on this later today to sort this out.
I also fixed my GH issue w/the Wemo switch, which I found was added by both linking to Wemo account and to SmartThings. I removed the Wemo link (which wasn’t working correctly) and now can control it via the SmartThings link in GH, and don’t get two messages from GH every time I tell it to turn the switch on or off (“OK turning it off”, followed by “I can’t reach the switch”).