[glens]

Hmm... a couple of bits about that, from the µTorrent forum..."For those with "HTTP 400" error or completely non-working RSS, that is a problem with NOD32. Please disable IMON or upgrade to 3.x........."
Now, I think allowing µTorrent under exclusion may also work...

open nod32 and select IMON and then SETUP

Select MESCELLANEOUS and then EDIT under the header EXCLUSION

Select ADD and select utorrent.exe file, the one you use to open the program and the select OPEN

Click Ok and then OK again

There is also available µTorrent 1.8.1 Beta Build 11903 (Selecting the "See list of changes" will get you the announcement page for the Beta)