[rgutter]

Not that I want to hold MS blameless, but I think I should add that while Firefox does work, the problem isn't restricted to IE - I now get an "Invalid torrent" error when I try to download directly from uTorrent as well. (Of course, it might be that uTorrent is making use of an IE component that's been recently "updated".) And the problem does seem to only occur on Trader's Den and Tapecity.

Windows XP Pro SP2, IE 7, uTorrent 1.7.7

P.S. Sorry for the crappy ratio - it's a temporary anomaly.