The usual answer is to (a) try deleting the cache file in the configuration folder (not sure where it resides on Lion); or (b) to delete the extensions and reinstall them. Make sure eCart or any other OLDER extensions (if you own them) are the FIRST extension to be installed, DataBridge and DesignExtender should be installed LAST (in any order.)
Do not install extensions that you own that have been replaced by Data Bridge or Design Extender either.