If I go into a course, and choose Assign Roles in left hand admin box, I get this message on an error screen:
This is an unknown context () in print_context_name!
I get same when in admin->Users->Permissions->Assign System Roles.
Moodle is 1.9.3+ (Build: 20090114)
Is this is the right place for this post or should I place it elsewhere?
Have you tried turning on debugging and seeing what message you get?