I am not sure if this is a fluke, but I have received a report from a user
that they cannot cancel a meeting which they created.

The situation is that the user has delegated access to their manager's
calendar. They created a meeting in that manager's calendar on his behalf,
and invited a distribution list. The manager is also a member of that
distribution list, so he received and accepted the invite. Now the delegate
wants to cancel the meeting, but does see the option to Cancel under the
Actions menu.

Has anyone else seen anything like this? It is almost as once the manager
accepted the invite his role changed from organizer to attendee and
subsequently his delegate was also an attendee.