Outlook - Blank forms in saved emails (.msg format)

We save emails with forms to the .msg format for audit purposes. However, some of our users only see a blank email when opening these files. The strange thing is that these are the same users that create the files - The forms display fine from the email itself, whether in the mailstore or archived to a PST. It is only the saved .msg file that gives a problem.

I know the issue is machine based as the same users can logon to other machines and open the files without issue. The issue is occuring on machines with Outlook 2003/2007 and WinXP/Win7. If anyone can point me in the right direction on which settings would affect this I'd appreciate it. So far I've checked version/SPs, security and macro security and the settings match.