Sources but no download
 

I have a download that was downloading fine, but all of a sudden it has stopped. The things is that there is 18 people it is downloading. I have another download that is just downloading fine.

I'm 'guessing' you are using LW 5 right"? Makes a difference because LW 5 & 4 are different. With LW 4 you could cancel the download & reselect from the search results. Or Pause & resume. With LW 5 it's rather limited. You can use the Try again function, else re-search the file to try to find hosts that it can connect to.