If your torrent client has a "recheck torrent" option, like uTorrent does, then stop the torrent and run it through that. Stopping the torrent first forces cached pieces to be written to disk. It should clear up the stuck at 0% status. If it doesn't, but the program still insists that 1.1GB has been downloaded, you may have to wait until it finishes. That 1.1GB HAS to be somewhere.