try reseting the workspace layout:
go to Window -> Work Space layout -> Reset '<your layout name>'
Then close Dreamweaver and Delete the Dreamweaver Cache file from the users configuration folder:
http://www.webassist.com/tutorials/Common-installation-issues
The master details page set server behavior is a native Dreamweaver interface. if resetting the cache file and the workspace layout don't work, you should contact Adobe support.