What was the install order?
I recommend installing in this order:
Deprecated server behaviors
eCart 5.0.7
free Tools 1.0.5
Design Extender 1.1.5
Data Bridge 1.1.4
try recreating the users config folder as outlined in step 12 of the DW Troubleshooting guide:
http://helpx.adobe.com/dreamweaver/kb/troubleshoot-javascript-errors-dreamweaver-cs4.html#main_user_config
then reinstall the extensions using the order listed above.