I have a site running JA_Business 2.5 template and it was running Joomla 2.5.3.
I went to upgrade it today to Joomla 2.5.4 and when I did, the administrators panel is all messed up. All of the icons are gone except for a single icon for Akeeba backup and it doesn't recognize that I am logged out or logged into the backend.
I have restored my site to the previous version 2.5.3 for a second time until I can understand what's happening with this upgrade.
If someone else has any information on what is wrong with 2.5.4 upgrade, please let me know. I have successfully upgraded to 2.5.4 that is running a different template (not one from Joomlart).
Attached are the various screen shots after what appears to be a successful upgrade.