I also have the same reported errors on starting Dreamweaber CS6, though I don't have the new 'sets' of extension. The error began after installing the Free Tools (I first removed the Paypal extensin, then installed Tools); removing the Tools extension has not fixed the error.
I see that one mail identifies CSS Sculptor 3.02 as causing this problem (it didn't used to) and that a fix/update is coming soon but it doesn't seem to have happened. How do I stop this really annoying error (two, actually: wa is not defined in shared.js, followed by wa_getextensiondir is not defined in RSSUpdate.js).
Thanks for the help