After editing the navigation menu to display subpages, it displayed access denied in place of the navigation bar. I then selected discard edits, and it came back with

Fatal error: Maximum execution time of 30 seconds exceeded in /home/apoprecords/apoprecords.com/updates/concrete5.5.2/concrete/libraries/3rdparty/Zend/Cache/Backend/File.php on line 962

I can get to the login page without any problem, but once I enter login and pw I get the above message. The error line will vary on each load. Is it possible to uninstall a theme without using the dashboard? Accessing any non c5 pages, or pages that dont use that theme work fine. you can see the error by visiting apoprecords.com