I'm running utorrent 1.7.7 on top of wine. Whenever I try to remove a torrent + data directly from the utorrent gui (not the WebUI), there's about 50% chance that utorrent will crash. Once it does, all hell breaks loose: sometimes data of torrents get screwed, sometimes the .torrent files get deleted from the Application Data directory and sometime other crap happens. A good friend of mine which is a very experienced torrenter was banned from two trackers for HnR after utorrent 1.7.7 decided spontaneously to delete all the data of his torrents, and decided to downgrade to 1.6.1.
I just spent about an hour manually re-uploading the .torrent files and fixing announce URLs to fix similar problems.
My conclusion is simple: utorrent 1.7.7 is crap, downgrade to 1.6.1 if you can.
There, just needed to rant a little. All better now.