Most issues with editor UI I have had were related to a missing zip file below modules. Sometimes the go MIA during build and deploy process. Might be worth a check?
Haven't seen that particular error though.
You can try to reinstall the CMS UI package to see if it helps
Could you please compare the episerver.config file from your integration environment (test site) if not matched then update accordingly?
Else, reinstall the Episerver CMS on production.
We have a problem with the admin top menu/navigation bar disappearing on our production site but not on our test site (which is a near identical copy, since we just did a huge move from test site to new production site). We can navigate to the admin pages by url, so we have access.
On our production site it looks like this:
with these error messages
On our test site it looks like this
Can anybody point us in the right direction?