Update/addition to what I typed below. It worked for a little while then stopped working again :) I'll call support again.
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After failures with trying tips from others, I contacted Apple Support. The problem seemed to have been solved after I followed the steps that were given me, by restarting in Safe Mode. Hopefully this is helpful to others:
And here are the steps to get into safe mode:
1 Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2 Release the key when you see the login window, then log in to your Mac.
3 You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.
If things work as they should in safe mode, you can restart normally to see if that has resolved it.