I removed Data Bridge from the Extension Manager, restarted Dreamweaver, opened Extension Manager and re-installed Data Bridge. The installer prompted me this question:
A newer copy of the file 'Machintosh HD:Users:PDW:Library:Application Support:Adobe Dreamweaver CS6:en_US:configuration:Commands:Installer_onOpen.htm' already exists. Do you want to replace it? I believe there are several files like this to go through.
I answered no to all. Should I answer yes to all?
The installation appeared to complete as it should. The same same problem persists however. The Form Builder dialog appears for a brief moment and disappears.