Try shutting LW down and restarting it. Sometimes that'll prompt it to finish the last little bit. Also try searching for the file again that might help it to find a couple sources.

If you can't get it to finish, you can just move it from the incomplete folder to whatever folder you use for movies. At most you'll just be missing some of the credits. Just remove the T-xxxxxxxxxxx from the title.

__________________
If it ain't broke, fix it till it is!