I never found this problem. Well, the Jum build doens't fix everything, but it reduces the CPU load, thet memory load, and a bunch of GUI bugs that can cause LW to crash.

The Limewire team has been aware of this issue for a while.

However, the error isn't a fatal. Worst case scenario, you get the message every time, you press "Yes" you want to keep on downloading it, and there you go. You get the file, listen to it/open it and listen or examine to see if it's corrupt. If it is corrupt, trash it, if it isn't, you got yourself a file.