On windows 8 pro(fresh install) avast free blocked utorrent connection to private trackers. But for me http connections were working in browser as well as in utorrent (public trackers).
After turning off the network shield, utorrent was able to make connection to private trackers. Is it safe to work on PC with the network shields off.
Try to deselect “Scan web(HTTP) traffic” under Web Shield control. But I recommend you to download the new installer and reinstall avast! using the new installer.