check your submit data connection path. Where does it point? When looking for the file, did you look in that _exact_ location? If your submit URL has /Forms/ at the end, then it will be in the hidden Forms folder where the template.xsn, EditForm.aspx, DispForm.aspx, and AllDocuments.aspx reside. For IP forms, you want the submit DC to point to the library itself with no extensions at the end.