Note to the lurkers who visit this site pretending that you're coming from a link on http://www.avantbrowser.com, welcome to my referrer ban list, this entire site is now out of your sight.
Legitimate users of Avant Browser need not worry.
[Update] That wasn't long. I posted a description of the problem on the Avant Browser forum, and got an answer within the hour (although the issue was reported by someone else three months ago). It's a bug in old code, nothing to worry about (apart harm done to Avant Browser's reputation). I'll lift the ban.