not working with an-1020 white ptcl wifi modem. i did exactly what u said .. all i was getting black screen. i even connected to the ptcl wifi modem directly but still unable to stream any channel, though it fetches the channel list flawlessly. To make it even more sure .. i ran the modem with ppoe ( usually i let my router to do the dialing in bridge mode) but still same issue.
i enabled the WMF and set the multicast rate to highest but still same black screen... called ptcl help line and they say smart tv already activated :S