what version of design Extender is installed? the latest version is 1.1.7, if you have a previous version, uninstall it from the extension manager, then log into your account and download the latest version, then install to the extension manger.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.