My apologies - I really should know better...
BitComet 1.13
OS: Windows XP SP3
router: THOMSON TG585v7 (wired)
The torrent where I first noticed this anomaly (don't judge me!):
http://www.monova.org/details.php?id=1530595&ref=
Trackers "inside" the torrent (as listed on Monova.org):
http://vip.tracker.thepiratebay.org:80/announce
http://tracker.bittorrent.am/announce
http://tracker.thepiratebay.org/announce
http://open.tracker.thepiratebay.org/announce
http://tracker.thepiratebay.org:80/announce
http://denis.stalker.h3q.com:6969/announce
Additional tracker listed on torrentz.com:
http://91.191.138.2:80/announce
Actual list of trackers from the torrent Task Properties in BitComet:
http://vip.tracker.thepiratebay.org/announce
http://tracker.bittorrent.am/announce
http://tracker.thepiratebay.org/announce
http://open.tracker.thepiratebay.org/announce
http://denis.stalker.h3q.com:6969/announce
As you can see, 2 of the trackers are not listed in the torrent in BitComet. I tried downloading the same torrent in μTorrent, and *all* of the trackers (including the one added manually from torrentz.com) appear and are working.
FWIW, I uninstalled BC 1.13 and reinstalled version 1.09, and had the same problem.
I just noticed that the trackers in the BC Task Properties dropped the ":80" found in two of the Pirate Bay trackers, essentially making the trackers http://tracker.thepiratebay.org:80/announce
and
http://tracker.thepiratebay.org/announce
"identical", and thus, I suppose, cancelling one out. I then tried removing the ":80" suffix from the http://91.191.138.2:80/announce tracker, and it finally saved in the BC Task Properties, and now appears to be working (logged in, returning 7 seeds). So I guess I just found my own workaround? ;)