Unsafe Website Blocked

I am getting 2 different errors via Avast.

Sometimes I am able to visit a website but it says the connection is insecure. When I look at the site certificate, it’s for search.dnsadvantage.com and the certificate is issued by avast (but expired in 2014). I think this is the avast service where I am using the avast DNS servers for added security but for some reason, it is broken when I visit this one site (but not for any other site).

Other times when I visit this site, I get a “Warning: Unsafe Website Blocked!” (via http://securedns.comodo.com/…) and it won’t even let me surf that website at all. “This website has been blocked temporarily because of the following reason(s): Prohibited Content: Site may contain content that is prohibited on this network” The website is dpreview.com, a highly trafficked photography website.

Any idea what is going on?

I ran several online scans with little to find mainly…
https://www.virustotal.com/en/url/c3ab33d91fa0e60d48b40a776cbbb5d412ca624fded711b73ef38224fd022027/analysis/1429899299/
http://quttera.com/detailed_report/dpreview.com
http://urlquery.net/report.php?id=1429899458064
https://sitecheck.sucuri.net/results/dpreview.com
http://www.dnsinspect.com/dpreview.com/1429899344
http://dnscheck.pingdom.com/?domain=dpreview.com&timestamp=1429900041&view=1

Then, having been assured it was reasonably safe, I went to that website without any issues.

What other/all of you security software (resident or otherwise) do you have? ???