Our users are unable to view attachments.

When trying to View a file the rendering file view window opens but all that is diplayed is a blank window. The attachments can be opened and saved.

The attachments can be viewed using the GroupWise desktop client on the same PCs used for testing.

Webaccess is running on a Windows 2008 r2 server.

The only document types that appears to be affected are those of MS Office 2003 and 2007.

I have tested using IE 8 and 9, Firefox and Chrome on both Windows XP and Windows 7 PCs.

I hope this is enough information.