Try uninstalling Data Bridge and installing it again in the extension manager.
After installing the extensions, open Dreamweaver, this should start the WebAssist installer. If the WebAssist installer does not start, you may need to open a PHP page to force it to launch.
after the WebAssist installer completes, make sure to restart Dreamweaver.
If you still have a problem, please list the extensions that are installed and the version numbers, just saying they are current does not really tell me enough.