Funny Thing on RTMPT

Well I found this since yesterday, when I ever I try to connect to my FCS conference room using RTMPT (HTTP Tunneling). The cam video is just not appear! But when I compared with the old version of my FCS conference room, and no problem. Then my guest is in my simpleConnect component but when I check it is not much different. And event I replace with the simpleConnect from the old conference. Still the cam video is still not appear. Could it be this is still because like technotes said that on HTTP tunneling will give impact of audio and video features performance?