It worked for a week ago so looks like this is an incompatibility with the latest DBus updates. 1.8.1 starts successfully.
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SunDog Engine / Nov 25 2017 12:26:24 WM: device start dbus: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file ../../../dbus/dbus-message.c line 1362. This is normally a bug in some application using the D-Bus library. D-Bus not built with -rdynamic so unable to print a backtrace