I am having an issue with my "add file" control in InfoPath. When I preview the InfoPath form it works fine; however, when I publish the form to the SharePoint site (browser enabled) I get an error when I try to upload an attachment in the form. I am using InfoPath 2010 and SharePoint 2010. I have never had this issue before. The error I get is:
The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.
Thanks in advance,