🚀 go-pugleaf

We have two computers in our organization that do not want to send forms to each other!

We created a form - one user (user A) tried to send a filled out form to another particular user so that he can sign off on it (using a signature field), but this particular user (user B)cannot modified the form at all!

User B gets this message:
"This document enabled extended features in Adobe Reader. The document has been changed since it was created and use of extended feautres is no longer available. Please contact the author for the original version of this document."

However, user A can send the same form to anyone else, and they can open it and use the form just fine - no message.
It gets even better - User B can open other PDFs/forms from other people and use them just fine as well.
Not to mention - if user A sends the form to someone else (user C) first, then user C forwards the form to user B WITHOUT MAKING ANY CHANGES - it works fine; we don't get that message.

If you can follow all of that and have any idea what may be causing this issue, I would greatly appreciate hearing about it! Both users have Adobe Reader 9, and the form was created in Adobe Acrobat 8 Professional. All on Windows XP. The person sending the email is using Outlook, the person receiving the form is using a web based email (but saving the document to the computer first does not help).

Thanks for the help!