I have the same issue: No incoming connections after upgrading to 0.9.1, from 0.9.0.4, in OS X 10.5.6. Speed was very consistent prior to upgrade, and has been cut in half since. Port is forwarded correctly and appears as open in other clients. Changing the utorrent port to something else and then back to the correct port solves the problem for a minute or so, and then the incoming connections are dropped and it turns yellow again.