In your config.php file add: $CFG->theme='boost'; to use a theme that comes with 3.7.x.
I see a red box @:
https://moodle.org/plugins/theme_adaptable
could be related.
'SoS', Ken
Re: Access lost to the admin area after upgrading to Moodle 3.7.1
by Ken Task -
Number of replies: 0