Using v2.2.1 because of the same reasons listed above. uTorrent was supposed to be a extremely lightweighted torrent program and it seem like the ones that bought it forgot that part and only see $$. I wouldn't touch 3.x versions ever and compare it to malware. There is a reason that most private torrentsites doesn't allow utorrent newer than 2.x. It's sad how they managed to ruin the greatest torrent program in such a short time...