uTorrent 3.1.3 (26837) not responding (repeatable)
Max Act Torrents 20
Max Act Downloads 5
Add 20 magnet links.
Wait for the active 5 to get the torrent file and start downloading the content.
Move any two or more of the "queued" magnet links up in the queue (any position between 1 and 5)
Causes uTorrent to go to NOT responding.
Reproducable in XP SP3 and Windows 7 64bit Ultimate.