I have also installed a new copy of WP on a test site and imported the DB and as soon as i do that i get that permission error so something in the DB has changed and i do not know what 🙁
Yes i installed the plugin and it refreshed the page and now im locked out of the admin panel with the same Admin user.
I have tried adding a new Admin and still no joy, i have checked my perms in the database and they are at level 10 and i have a very busy eCommerce website so im a bit stuck.
is any one available to point me in the right direction ?