well, you say you had already tried the previous suggestions:
Go to WebAssist -> Preferences in the Memento section Set the Show in dreamweaver option to Never.
In the RSS Section, check the option to disable all RSS Feeds and Check For Updates only when Memento opens.
Then go to Window -> Work Space layout -> Reset '<your layout name>'
and Delete the Dreamweaver Cache file from the users configuration folder:
if that does not work, the the configuration folder has become corrupted and recreating it is the only way to fix the problem.