Comment 7 for bug 1258655

Gerry collected this helpful dbus log http://pastebin.ubuntu.com/6567567/ (also attached) that shows we get an on, on message from dbus.

the error shown:
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >'
  what(): could not activate surface with eglMakeCurrent

will happen if mc::Compositor::start() is called twice in succession. Still trying to figure out if the on, on message from dbus is something we should handle, or if something is getting confused somehow.