I can’t see anything that avast would directly alert to, i.e. the site seems to scan clean.

I can’t quite fathom this one out…Ignoring the network shield, I don’t get any alerts on the site, but trying to translate with google causes an alert
(This however could be related to the way google translate works - including the site within a frame…and if the site is blocked by network shield then could cause an alert.)

That said, this clicktale seems interesting…
http://www.mywot.com/en/scorecard/s.clicktale.net

Either way, I’d say that this needs someone from the avast team to comment.

Scott