Download Master seems to be a very sucky client. I am experiencing the same queued/transferring transitions all the time. What's more, I haven't managed to download anything larger than 1 GB: at a slightly larger downloaded size DM decides that number of peers has dropped to 0 and stops downloading.
Additionally,
1) downloads are not resumed if router is restarted
2) some BT downloads won't initalize: a perfectly valid torrent file doesn't get the 'BT' network label and filesize is set to be '2B'