Description of my issue:
I read the existing article on Fatal error after Joomla updating from 2.5.8 to 3.3.6 but unfortunately installing akeebabackup 2 times in a row does not fix the issue for me. Basically If i log into the backend of my joomla sites as an admin I receive this error Fatal error: Class 'Akeeba\Engine\Platform' not found in /home/xxxxx/public_html/plugins/quickicon/akeebabackup/akeebabackup.php on line 198
This is happening on 8 different sites I have all of which was upgraded from joomla 2.5.8 to 3.3.6. If you log in as a super admin this error does not show up it only happens when you log in with admin permission.
This is pretty urgent now, none of my clients are able to log into the back end of their sites because they all only have admin permissions.