InfoPath Dev

Hello.  I have created an InfoPath form that is saved on a SharedPoint site.  After it is saved, it is sent via e-mail thru Outlook 2010.  When the form is opened, we go to File -> Save & Send -> Send Using E-Mail -> Read-Only Snapshot.  We have been using this method for about a year now.  Within the last week an error occurs when trying to send. 

The error states: InfoPath cannot remove the e-mail header, because of an error. You can still work with the form normally.

I have looked every where on why this would all of a sudden be occurring.  No changes were made to the form, so we are not understanding what happened.  Any help would be greatly appreciated.

 P.S.  This same occurs when try send using e-mail for the other 2 options: Send Form and Send Form & Template

Does it happen on all machines or just some?

Have there been any updates on those machines?

It does not happen to all machines.  Any updates are done automatically by our IT department; therefore, I do not know specifically for each machine.  What updates would affect the form to cause this error?

Was a solution found to this error?

I am using Outlook 2010 and InfoPath 2010, and I am encountering the same issue.