The latest beta is choking my network as soon as I start downloading something in uT. I didn't have this problem with RC4. The scenario is as following: I'm connecting through a PPPoE protocol, start dling something in uT, I max out my connection in 10-15 seconds, then speeds drop almost to 0 and practically my internet connection is killed (uT, but also for browsing). I disconnect and reconnect again to the network (without shutting down the uT) and the second time all is good, no more choking. RC4 worked just fine for me. I'm on a fiberlink connection, win 7 Premium x86, default settings for uT except 'bt.tcp_rate_control' and 'net.calc_overhead' to false.