div#Tabs missing in Lessons

I have just created a new instance of an existing Opigno installation and all is well apart from the div#Tabs section is no longer being created for Lessons (It is not present in the HTML for the page). Other pages have it as expected, it is just Lessons that it is missing for. Logging in as Admin users. Have tried different users and it is the same for all admin users. Only difference between the instances is Opigno version as I updated the new instance to the October Release. Any thoughts as to why it is missing? We are using a workaround to edit through [Content] but it is a pain to do many updates that way. Update I have just run cron and updates (5 modules non-core) and now I am unable to run any admin functions from the top admin bar (including update, modules, people and Content). I get the error: " ERROR The website encountered an unexpected error. Please try again later." Further Update Checked the Error log manually (as couldn't through the admin menu) and found the issue is PHP related: [01-Dec-2014 14:53:16] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20060613/timezonedb.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20060613/timezonedb.so: cannot open shared object file: No such file or directory in Unknown on line 0 Will go through and debug the PHP install on the server to eliminate it from the diagnosis Any thoughts before I blitz the install and start again? Many thanks, Tim P.S. Revisions are still the bain of my life. Any option to switch them off?