What extensions do you have installed?
the extensions that we offer that are compatible with Dreamweaver CS 6 are:
eCart 5 (or 6)
Design Extender, Data Bridge, and Free Tools are consolidation extensions. design Extender is a consolidation of the Design Related extensions like CSS Sculptor and Menu Writer. Data Bridge is a consolidation of the Dynamic extensions like Security Assist and Data Bridge. free tools is a consolidation of the free extensions.
if you have older stand alone extensions, you will need to upgrade in order to use them in DWCS6.