LW drops sources as a file nears completion. This frees up sources for others to d/l from but sometimes the file will get stuck at or near 100%. Try shutting down LW and restarting it. That usually prompts the files to finish.
If that doesn't solve it, go to the Incomplete folder and check the file size. It might have already finished the download and just hasn't shown it. If it is a media files, try to listen/watch it moving to its end to see whether it is complete.
Cheers
FOTH
