can you send a copy of the page before adding the plugin in a zip archive so we can try to reproduce the issue.
Is it a static or dynamic plugin you are applying?
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.