Small group shared calendar does not update

We are having the same problem. Any updates to this issue? To clarify, we are experiencing the following:

1. User creates an entry, appointment or invitation, on the Group calendar from Outlook desktop client (subscription).

2. For other users to see the entry, they need to deselect the group calendar, and reselect it from view. This seems to "update" the calendar.

All changes are immediate and visible in OWA, they just don't sync back down to the desktop client unless the calendar is unchecked and rechecked. We can't continually expect users to refresh their desktop calendar every time. 

Any recommendations would be great!