Unable to edit the migrated public folders permission through exchange admin center

Hi,

        I migrated public folders from Exchange 2007 SP3 to Exchange 2013 CU2

After migrating, i am unable to edit the properties of the migrated public folders through Exchange Admin Center

Googled and then ran Get-publicFolder -Recurse | Get-PublicFolderClientPermission | Where {$_.User -like "NT*"} | remove-publicfolderclientpermission

Then forced the AD replication

I have 6 PF mailboxes

Still i am unable to edit permissions of 70% of the public Folders

Getting 500 unexpected error

I force AD replication, still no go

nothing different a working and non-working public folder

Any constructive ideas?

Thanks

Sadiq