If sites are not saving on a Mac this may end up being your only option. Just go to the settings, click on Users, and then the little plus sign to add a user. Try logging into that account and start up Dreamweaver and create a site. If the site stays on that account when you close/re-open DW then this is definitely a corrupt user profile. At that point, the simplest transfer is just going into your hard drive and moving the documents/pictures/etc folders from the old account to the new. In some cases you may have bookmarks or other program settings in your user library (~\Library from the Go To Folder command), but you should try to avoid this as this is the area that would be affecting Dreamweaver. So you might need to re-configure preferences in some programs but overall your Applications will already be installed and working.