I have XBTIT last svn revision + XBTT (try different versions). Tracker used rating. announse likes http://xxx.xxxxxx.xxx:2710/xxxxxxxxx...
I or another user upload torrent, then download torrent, open in torrent client (uTorrent or other).
Sometimes (may be 1 from 100) i get error Unregistered torrent. Refrash tracker announce or wait next announce not resolve problem. I think this torrent not added in XBTT tables or was deleted in some cases. This happen not often but this happen.
if i delete torrent from tracker then upload this torrent, all work good. In otherwords torrent file is not root of problem.
Tracker has 100 000 registered users, 8000 torrents and 20 000 visiters in 24 hours.
I think load is not much.