OK, that seems logical. So when I do the search for a file, just do the search and then double click the file that is awaiting sources and it will connect with the new source?
Thanks for your help and explanations. It's appreciated.

I perhaps shouldn't be suggesting this, but another option is to try Phex as a backup program. I find it finds files LW doesn't always find. Phex tends to connect to different peers from around the world (at least it does from where I'm based.)