All in One Event Calendar navigation buttons don't work after site migration

When we migrated our site to a new server, the All-in-One_Event Calendar navigation buttons in month view (previous year or month, next year or month or loading a day or week view), stopped working. It spins forever trying to load /calendar/action~month/exact_date~(etc…. and for example), or switches to loading some entirely unrelated recent post (successfully when it does this).

The calendar is at https://www.akenergyefficiency.org/calendar/ if you want to check it out for yourself.

I’m not the IT person, but the IT people are very responsive when I can point them toward what the issue might be, and I can fiddle with code a bit if need be. So since it happened coincident with the move, what should I be looking for? Database issues? All the events are there, and show up when the current month is the month they are in. File permissions? This has been an issue with some other stuff after the move – but what files or folders? What else?

Thanks so much, and let me know if I can give additional information!