Okay, for all those users out there that might be going through the same issue, I just hang up with Jason and he got it fixed, was really easy.
Not sure if this is going to work on all scenarios, my case was that I had a brand new PC Intel Windows computer, a fresh Dreamweaver CS6 latest version (12.0.1) installation and I installed some DMXZone extensions, and then Data Bridge, Design Extender and lastly eCart (all latest versions).
I was having problems with the Spry Validations that come built-in DW, the error message was: "WA_getDocumentDOM is not defined"
To fix it this is what Jason did for me. He uninstalled Data Bridge and then re installed it, making it the last Webassist extension installed. Also, the cache was removed. That solved the problem, Spry validations were back to life and so did I.
Thanks Webassist for the great support.