Howard Miller

That isn't going to do. Precious few people read that page anyway but they're not going to see that. It needs a BIG WARNING right at the top.

It's worse than that - that's just the developer docs, which only developers will read. That's (effectively) almost nobody.

The pages that matter are these...

https://docs.moodle.org/501/en/Upgrading

https://moodledev.io/general/releases/5.1

Neither of which say a word about the restructure. So, this is going to interesting on Monday. Unless, of course, somebody is planning on updating them? Or I've completely missed something (not the first time).

Have you assigned your "students" to some other role at a higher course category or site context? It'S *very* unusual to need to resort to "prevent".

Ok - you did say that you had reset the student role to default.