These forms ranged from formmail 1 to NMS formmail 3.11 and not a single one worked correctly.
We've traced the problem to the windows update last week. In fixing the phishing and domain name spoofing they have created bugs in how IE handles text field ID's on secure servers.
If you use formmail and have it running on a secure server only please run a few fake orders to see if you have been affected by this.
The update only causes problems for IE based browsers and those using IE's DLL (Like opera). Netscape users are unaffected by this.
I can't find anyone else who has found this problem yet but I doubt many check order forms as much as I do. If this has affected you please let me know.
I've managed to get the forms working again by shortening the ID to around 5 to 7 characters and removing any - or _ I had in the ID.
Simon.