I thought they changed the theme on v7.5.8 after some complaints about the same issue.
It was like 2 weeks after the initial release but the version was not changed.
they call it a refresh.
Try downloading a fresh zip and just upload the admin sections.

In fact you may want to just replace all files.
just follow the upgrade docs for files to replace. but don't run the upgrade.php file again.

Last edited by Ruben; 07/21/2014 5:36 PM.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers