Here's my network setup: WRT54GL - router and central wireless access point Airport Express - wirelessly connected to the WRT54GL in Client mode for use as an airtunes speaker client G4 Titanium Powerbook - connected via Airport Mac Mini - connected via Airport Starting with the Powerbook, iTunes connects without any trouble to the Airport Express and streams music. On the MacMini, however, iTunes recognizes the Airtunes speakers, i can choose them but can't...