Joomla Admin缺少元素

I have a Joomla site that I maintain and for some reason now when I log into the administrator section it looks like the below image.

I have tried all sorts of debugging but cannot seem to figure out what has happened.

There is no PHP errors. No JS errors. I have attempted to create a new user manually in the MySQL DB.

I am unsure if one of the other administrators of the site has performed an update and this has happened. I have manually updated the site to the latest version with no success.

Missing Everything

EDIT

Some Debugging Stats:

Working Joomla! Site

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Broken One

enter image description here

It does not appear to even perform the database queries. (Still no errors)

There are two reasons for this problem to happen:

  • Errors on the Joomla website (perhaps caused by a non-core plugin). Try disabling non-core plugins (from phpMyAdmin) one by one and see if the problem is resolved.
  • ACL issues caused by a wrong modification to your ACL

The first thing I would check is the ACL (in the database) and make sure that everything's correct.