Hi Anne! You've done all the troubleshooting that we need to diagnose this problem, so thanks for that!
It sounds like the form upload corrupted your form database and that's why you are seeing the infinite refreshes. This is a problem that has been improved in newer versions of Aggregate, so I'm betting you are using an older version.
https://github.com/opendatakit/opendatakit/wiki/Aggregate-AppEngine-Troubleshooting has a guide to repair the database, but it does require someone who is technical and detail oriented to fix it. If you don't have anyone like that on staff, update this thread and I'll try to find someone who can help.
Finally, if you get a chance, please introduce yourself here. I'd also encourage you to add a real picture as your avatar because it helps build community!