We also had this problem when creating our Departmental Administrator role to assign at category level and our Preview role we assign as the default role for logged in users. I've written up my thoughts on Moodle's use of course:view and our current workaround here
http://moodle.org/mod/forum/discuss.php?d=107390
Regards,
Alison
Roles and permissions
Help in creating a new role: Category Administrator
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