Howard Miller

You need to find where the error 500 is getting logged. The logs *should* contain additional information that will help. You may need to get your provider involved.

You should also enable Debugging. As you can't get to the setting in the UI, you will need to add the debugging lines in your config.php. See the highlighted link for details.

 

'Error 500' is as unhelpful as "Something went wrong" so we're hoping to find a clue, somewhere.

There's no such directory in Moodle 4.5 as /api

Have you set up (or tried to set up) the new Moodle router?

I have to say that I've not noticed this. I've always found that clearning and changing criteria (and I do it quite a lot) has recalculated almost instantly.

So consider that something might not be working properly on your site.

As (I'm reasonably sure) that this is a Moove theme issue - you might be better asking in https://github.com/willianmano/moodle-theme_moove/issues

If you just want to DO SOMETHING... I'll repeat what I said earlier. Get yourself a Redis server and point the sessions at that. Redis tends to work "out of the box" and the config is simple, so it's not a stressful thing to try.