no, you don't need to use a local testing server.
maybe look in the site settings. as this is a DW issue, you should probably contact Adobe support for more help.
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.