Ultrapeers have zero to do with BitTorrent, and even if you claim uTorrent sucks, I would recommend using it for torrents instead of Limewire. Limewire does not show the necessary info to tell what is wrong, uTorrent does.

There can e.g. be no more seeds on the torrent. Your ISP might be blocking Limewire or torrents certain times of day. Limewire can be getting banned for not respecting tracker scrape times etc.

BTW if you hate uTorrent so much then use Azureus. It's in my opinion even better than uTorrent.