InfoPath Dev

After publishing an updated template, I now cannot access 3 infopath forms and getting the error in subject.  Does anyone have a suggestion on how to open these forms?  I have tried to open in browser, publish an older template, and using INFOPATH with no luck.  The error is associated with Digital Signatures; however, I have the option "Not to update existing forms" selected.  Any help would be greatly appreciated.  Thank you.

Hi - you've probably resolved this by now - but if you have the option not to update selected and you changed the template's schema at all, this would be the anticipated result. You'd need to undo any schema changes OR allow the template to update existing (which will likely remove digital signatures). If you are in doubt as to the schema of your saved files, open them with a text editor so you can see the XML.