If you try to save a toolbar to disk it will save as empty without any buttons. Workaround is to create the toolbar in the Toolbar Prototypes Encapsulator then save the Toolbar Prototypes Encapsulator to disk. Reload into trueSpace in a different location and remove all the toolbars except for the toolbar of interest, optionally rename the encapsulator and save to disk. Now loading this encapsulated toolbar won’t loose the buttons.