Unable to open archived items in shared mailboxes

Hi all,

when someone has a shared mailbox open in their Outlook, they are unable to open archived items in that mailbox, even if they have full permissions. Opening the message brings up a banner that says;

"This item has been archived by Enterprise Vault
Click here to view the original item"

Clicking on that does nothing.

"Allow Script in Shared Folders" is set to 'Force On' in all desktop policies (has always been like that).

Environment is:

Enterprise Vault 10.0.3
Exchange 2010 SP3 RU1
Clients are Outlook 2007 on XP and 2010 on Win 7

Any ideas are much appreciated.