Hello everybody... Autodesk released a new version of Design Review, unfortunately, this new version doesn't allow you to add a digital signature to your DWF, for some government entities this is a must have, so if you updated to the new version you will need to rollback to the 2013 version in order to make it work.
Sadly it is no way to get this from the Autodesk website, so here is a link that you can get it from...
Autodesk Design Review 2013 installer