nothing to do with utorrent, check the oink forums, I've seen something similar there few days ago (sorry, can't remember what was the answer...)
Just out of curiousity which version of UT you using? Maybe the version your using is banned and they dont officially label it as banned when your client connects
Update to utorrent 1.6 yo!!!!
Temptations The Ultimate Flaw In Humans
a lot of sites ban obsolete versions of the client, oink being no exception.
I only mentioned that as a thought cause I do the same on mine with new versions ussually.
For me, I have to be logged into Oink before I can download.