iNotes File Attachment Doesn't Open/Download

Domino 6.5.1 server, user with Domino Web Access 6.5.1 Mail db. I was able to duplicate the problem locally as well. Send an email with an attachment from iNotes, then open the Sent folder, try to open or download the attachment and it never completes. Gets all the way to the end of the progress bar, but the file doesn’t save or open. All help is greatly appreciated!