Not sure if this helps, and maybe I am a little late on the subject, but I compared the "finished" file size in the Shared folder to the file listed in the Shared Library within the Limewire application.

The "finished" file thinks it is one file size and Limewire says that it has completed a slightly bigger file. So, it seems to me that the file didn't actually complete the download. Again, resuming the download doesn't work because Limewire already thinks it finished the download.