I've had that happen forever, too. I re-did the file associations once but it didn't help. I tried a few different trackers just for fun:
Opens straight in utorrent:
DAD
OneMoreSolo
etree
PureLiveGigs
Open with... greyed OK:
Zomb
Tapecity
JamToThis
Opens in (temporary) new tab, greyed OK:
TTD
Using XP SP2, FF 2.0.0.3 and uTorrent 1.6 build 474.
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