Yes!!! Step 12 worked. (Renaming the Configuration folder.) Thank you so much, you're a star.
Anyone else trying this on Lion or Mountain Lion should note that the user Library that contains this folder is not visible by default:
/Users/[username]/Library/Application Support/Adobe/Dreamweaver CS6/[language]/Configuration
You have to go into Terminal to make it visible, see the tutorial here:
Also note: there's another Configuration folder within the Dreamweaver Application itself: Macintosh HD/Applications/Adobe Dreamweaver/Configuration, however renaming is no help at all - it makes Dreamweaver crash!
It is only neccesary to delete the file ssh_hosts located in the or manually delete the entry for the host you are unable to connect to. The reason is that the ssh-key pair kept for the site has changed for some reason. Dreamweaver has a strange way of handling this, and it indeed should notify the user in the samme way that ssh is, warning you about the risk of being in a man-in-the-middle attack.
Anyway, to get access to the /Users/[username]/Library folder, you just open the Finder and open the 'Go' menu, now press the option-key and Library will appear on the list.
Worked well for me OS X 10.7.5. Thanks!