I have just updated our development Moodle server from version 2.4 to version 2.7, after upgrading php to version PHP 5.5.12-2+deb.sury.org and apache to 2.4.9. After transferring my config.php and custom theme the upgrade was completed successfully. Trying to access the site lead to a complete White screen.
After removing my custom theme from the themes folder the site loaded however I only get a webpage saying Elearning website and you haven't logged in ( in greek ).
Can someone please let me know what I should look for as I am pretty new at this ?