We have recently made some minor changes to one of our InfoPath templates that uses Digital Signatures and upgraded the Forms library in SharePoint that already had a number of forms there.
We now get the following warning "This form is digitally signed, but was created with an older version of the form template. This form will be upgraded to work with the new template, but this may remove its signatures. Do you want to view the signatures before upgrading?"
whenever we try to open one of the existing forms (i.e. one that existed prior to the template upgrade). If we proceed it invalidates the signatures stored in these forms.
Can anyone suggest a solution?