If you are using uTorrent 3.1, there is a bug in your client which affects you.
The bug essentially culminates in your client wasting your bandwidth, affecting your ratio and banning all the other seeders in the swarm from uploading to you. The apparent result is no seeders on the torrent and the inability to progress passed mutliple hash check failures.
The following link will allow you to read more on the bug in question,
http://forum.utorrent.com/viewtopic.php?id=108522
We recommend you immediately downgrade to this version of uTorrent. Before beginning the install, take the following steps necessary to backup your existing torrents:
1) Open up a Windows Explorer menu and enter: %appdata%.
2) Copy the uTorrent folder to your Desktop.
3) Uninstall uTorrent 3.1 and install the version at the above link.
4) Exit (right-click, exit) uTorrent and delete %appdata%uTorrent.
5) Copy the copy (lol) from your Desktop back to %appdata%.
Re-open uTorrent and you’re presented with your previous torrents list.
Apologies for the inconvenience. We will let you know when an update to uTorrent is made available with a resolution to this bug.