I've just arrived here with the same problem, it appeared first about 8months ago.

I found a thread on the gnutella forum, but can't for the life of me find it again.

Someone issued a list of IP addresses to block, apparently it is a Music Industry attempt to flood networks like these with corrupt files cloaked to look like .mp3.

I had thought it might be something dear Mr Jobs had added to files downloaded from itunes to prevent further sharing.

He would have had to agree to do something to help, in order to get agreement to his service, and it was only newer songs that initially had the problem.

But it now appears to be getting worse, with more and more T3 and higher sources, offering presumably more and more corrupt files, it is an ingenious way to prevent our activity.

Anyway that's what I've pieced together from the last hour or so reading this board (which isn't the easiest board I've ever navigated)