Well in the past avast's web shield has been very accurate in these detections.
I'm at the bullboard index page and no alert, so you will have to be more specific on the URL, change the URL from http to hXXp or www to wXw, to break the link and avoid accidental exposure to suspect sites, thanks.
If they are in areas like My Favs, etc. where you need to be a member, etc. obviously I can't check it out.