Exchange 2013 - Shared Calendar problems

Since we put in Exchange 2013 in July 2013 we have had a problem with Shared Calendars. Even though a User has Owner Permission on another Calendar, New Appointment is Grayed Out and the User cannot add or amend and occasionally Outlook will hang.
We have tried Outlook 2010 and 2013 Clients as well as Cached Mode and Online Access. Exchange Server Standard 2013 CU2 was installed and this seemed to stop the problem for a while and now it has returned.
Permissions have been removed and reapplied both through the Exchange Powershell Interface and on the Mailbox. All other aspects of the system seem fine.
Any advice would be welcome.

Hi,
Please check your application logs in your Exchange server. Confirm whether there are some error logs such as Event 9646.
It may because there are too many users connect to shared calendar at the same time that cause this issue. And there is a limit on the number of items that clients can open.
If so, we can change regedit
on the Exchange computer to resolve this issue. For more information, please click the following KB:
http://support.microsoft.com/kb/830836/en-us
Thanks,
Winnie
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