A few months back someone reported that they were having issues with RSVP loading and not loading. I’d made a few changes and the HTTPS certificate hadn’t been installed properly. I reinstalled it and thought that fixed the problem.
It didn’t.
In fact at some point something broke and no one could access anything past the first page. Yikes.
I then proceeded to delete the whole thing in an attempt to move it.
I reinstalled a MONTHS old backup and it fixed everything.