Now widget no longer works after 4.4rc3. Any ideas how I can debug it?

Hello all, I've just updated my F12 machine to 4.4rc3. Since the upgrade, the "now playing" widget no longer displays the current album/track name/time and the only functional buttons are "next/previous track" and pause. I checked upstream and I don't see any bug report concerning the "now playing" widget and 4.4. As such I rather post an informative bug report (as opposed to "widget-no-workie!"). I assume that this widget uses dbus to communicate with amarok, can I somehow capture/monitor this traffic? - Gilboa