Fatal error: Call to a member function isAdmin()
I have similar issue.
Fatal error: Call to a member function isAdmin() on a non-object in E:\wamp\www\xxxx-up\plugins\system\jatypo\jatypo.php on line 58
Am running on Joomla 2.51 and WAMP 2.2c
I've just renamed the jatypo folder in plugins until you guys figure out the issue.
By the way it is most definitely not solved.