It looks like the same issue I was having. For whatever reason (possibly because keysize was depreciated), the new version really does not like the keysize variable in ovpn files anymore, so you have to go into the ovpn file for your tunnel (it'll be in your appdata/binhex-delugevpn/openvpn folder) with your text editor of choice and either remove that line (make sure not to leave a blank line there), or add a # in front of it to turn it into a comment, so it gets ignored. If that fixes it, please let us know.