It looks like uTorrent has been dropped of the default list of P2P applications, so if you check it you have then customised your setting.
I believe that this has been taken off the default list because of the way utorrent works, it seems to swamp the system and avast is trying to keep up with it and some people find that slows the download, etc. This is just one such topic I found using the search,
http://forum.avast.com/index.php?topic=28467.0I suggest a forum search for utorrent and you should get an idea of the problems some utorrent users experienced and the recommendation was to disable the utorrent scan in the P2P shield and have utorrent scan the completed file with ashQuick.exe.
So it looks like Alwil have taken notice of these issues and unchecked the utorrent in the 'default' settings.