InfoPath Dev

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?

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 ...