Calendar permission changes not reflected

[cbeach47]

Changing permissions on the calendar is not being reflected.

1. As admin, add a new unauthenticated iCal feed (such as https://calendar.google.com/calendar/ical/en.australian%23holiday%40group.v.calendar.google.com/public/basic.ics ) and make available to Everyone.
2. Login as the staff user. Observe calendar and events appear.
3. Log back in as admin. Change the permissions on the recently added calendar to 'Portal Administrators'
4. Log back in as staff and observe that the calendar still shows up

Clearing the cache does not appear to help.