Effective immediately: µTorrent 3.x banned
Due to serious security issues we're banning µTorrent 3.0 and higher. It is most urgent that users move away from that platform due to the risk of passkey leakage or worse!

2.2.1 users should also make configuration changes to harden their installation and restart the client.

More information about the issue and 2.2.1 modifications can be found this thread.