to Reload the Data Bridge extension, open the Extension Manager, uninstall data Bridge, then install it again.
when you open DW make sure the WebAssist installer runs to finish the installation, after the installation finishes, make sure to restart DW.
NOTE: There is bug IN DW 6 when running in Mac OS Yosemite that is causing a memory leak, this is most likely the cause of Data Bridge crashing on you. We are looking into finding a work around for this, but so far have not been successful.