What extensions including the version numbers are installed?
try recreating the users configuration folder as outlined in step 12 of the Adobe troubleshooting guide:
http://helpx.adobe.com/dreamweaver/kb/troubleshoot-javascript-errors-dreamweaver-cs4.html#main_user_config
after renaming the config folder, open Dreamweaver to recreate it, and close Dreamweaver. Then open the extension manager. uninstall the extensions, and reinstall them.