Notes 8 MAILTO Attachment Not Created

I have users of a form that uses MAILTO function to open a note under Lotus Notes with an attachment that contains information to be submitted. Some users are now migrating to Notes 8 and when the Submit is done on the form, a note is generated under Notes but the attachment (POSTDATA.ATT) is not being generated. I have tested this on my system with no problem. The user that is having the problem worked fine with Notes 7.

The form is an HTML/JavaScript form that runs under IE 6 and Windows XP. When the submission button is pressed, it invokes a function that contains:

 document.updateForm.action = "mailto:XXXXX@SYSTEM.VNET.XXXXX.COM"  (text for subject, note body, etc.)

 document.updateForm.encoding = "multipart/form-data";

 document.updateForm.method = "POST";

The note is being generated in all cases and the note “to” address, subject and body text are fine. When it works there is an attachment file as a result of the POST method. When it does not work, the attachment file is not present. Other than the missing attachment, everything seems to be the same.

Given that Notes, IW and Windows XP are all involved, the number of options that could be impacting the process is large. What I am looking for is 1) pointers to any known problems with Notes 8 and attachments, 2) any settings in Notes 8 that could control attachments, or 3) any suggestions on how to go about debugging this. Is there anyway to trace what is happening in Notes?

Just as an FYI, we have many users on Notes 8 that are not having the problem and just a very few who are.