Script error opening Vaulted emails

I have a couple of users that are unable to open Vaulted email when searching for emails - they get the following error pop up - has anyone come accros this and how do i fix this - I should say it works fine if i get them to use the browser search

Script Error

! An error has occured in the script on this page

Line: 244

Char: 1

Error: Automation server can't create object

Code: 0 

URL: HTTP://servername.domainname/Enterprise Vault/searcho2k.asp

This has worked perfectly for years and works for all other users until now