Gnotella has done that to me too a couple of times, but has then suddenly decided to work again, so I don't have a cure.

What you can do though, is to find the same file(the same name and filesize), start downloading that, abort the new download as soon as it starts, go into your incomplete downloads folder, rename the new file so that it's called exactly the same as the old file, and resume the download.

You see, there are some numbers infront of the filename that Gnotella generates, and if you change the name of the new file so that it has the same four digits infront of the filename as the old file has, Gnotella will think it's the same file, and continue to download from where you were, for instance at 50%.

It has to be the same file though(same file size).

If that made any sence....