If you're using Myspleen, the only torrent tracker used must be "http://www.myspleen.org/announce.php", and after you upload the .torrent file to Myspleen, you must redownload it and make sure the re-downloaded .torrent still sees your files in uTorrent (if it doesn't, right click, use "Advanced -> Set Download Location"; then right click and use "Force Recheck")

The reason why you must redownload the .torrent file after uploading it is because Myspleen wants to make completely sure that no one outside of Myspleen users can see it, so it disables the file from using peer exchange and distributed hash tables.