in Build 1170 there is still (or a new?) problem with UPnP. Random Port at every start and UPnP are enabled but when you start µTorrent the port changes but UPnP doesn't do anything. When i disable UPnP, close the prefernces, and enable UPnP again, everything works fine. I'm running Windows XP SP2 right now and this evening i could try out on a Vista (32Bit) Machine