Howard Miller

The only pack that "comes with" an upgrade is English. And you get that with the upgrade.

Other than that, read... https://docs.moodle.org/500/en/Language_packs#Language_pack_updates

https://docs.moodle.org/500/en/Session_handling#Read_only_sessions

As I have said before, this type of error is usually just a symptom. Something else is timing out and locking out your session. It can be quite challenging to find out what that is. But the sort of scenario you describe is quite typical.

I can't help thinking that sounds like they should be separate courses.

Ok - I'll move this to the Themes forum. You may also want to contact the Adaptable theme devs directly.

Have you checked if this is still a problem if you switch to the Boost theme?