Ah sorry I guess more info mite be helpfuly
Using dreamweaver CS6 and the eCart is 5.0.6, Design extender is 1.1.1 and then Data Bridge is 1.1.3. There is no error massage's. The only thing I get is when installing the extensions it asks to overwrite some files which webassist says to say "yes to all".
The only way you know that its not working is the buttons don't highlight as I have maked in the image below.