Same issue here. I ended up calling Adobe and the only way we could get it working was to rename the adobe configuration file under my user ID and delete the registory key for Dreamweaver (ex: Resolution : Recreated the preferences by renaming and configuration folder from C:\Users\User_name\AppData\Roaming\Adobe\Dreamweaver\En_Us\Configuration to Configuration_old then
Deleted folder Dreamweaver from Regedit - HKEY_CURRENT_USER\Software\Adobe\Dreamweaver )
I then had to deinstall and reinstall all extentions for WEBASSIST to get everything working correctly. This just happen to me last night....getting very fustrated and almost scared to use DataAssist again since it forces me to start from scratch on everything I have done with the other products. The good news is that I am keeping faily good notes on what I have done up to this point so it is not a total diaster.....Someone really needs to fix this bug!!!! THANKS!