seeding connection for the latest version seems to stop for all except for 2 torrents. when I restarted it, 4 became active again... I'm currently observing how long before upload grinds to a halt again. Update: downloading the latest build again then rebooting the machine seems to have done the trick...
I still have to restart utorrent every few hours... otherwise, upload simply grinds to a halt. Once restarted, everything functions normally again. This started after build 24120. OS is Win Server 2003 static IP with IPv6 Toredo enabled.