Here is a fix: "do a search of your local system for the file tempURL_aftersave.htm and in_afterSave.htm. You will find them both as they are not suppose to be their but will remain if DreamWeaver crashes as some point and does not clean up the files. Once you find them on your local machine simply delete the files. Dreamweaver will stop issuing the warnings but will function properly after that.
The files are in these paths: Program Files\Macromedia\Dreamweaver MX 2004\Configuration\Commands). Program Files\Adobe\Adobe Dreamweaver CS3\Configuration\Commands).
Delete the Files and you will be fine(Works for CS2,3 also)