Good morning Amelia!
Thanks for the quick reply. I made a copy of the activity in question. Unfortunately, that didn't fix the issue. I'm still getting the Error: Invalid Fields when I attempt to Save or Save Draft and Close.
Is there anything else you can think of that might be causing this?
I've even gone so far as to create an activity from scratch, which presented a different set of problems. Like experiences disappearing after they were added.