Well, I'd ask at the PC-cilin website. I don't use that one, but haven't had a problem. Generally speaking the following possibilities present themselves:
#1: PC-Cilin is borked, or too sensitive to something.
#2: This site is putting out spyware/tracking cookies/whatever but it's so well handled that most other protective programs are bypassed, but yours for some reason catches it. I wouldn't think this site has any kind of actual "Virus" in the general sense, but it *IS* a business and I don't remember seeing anything specifically saying that they *don't* partcipate in such things. On top of that they also seem concerned about traffic and to pay some attention as to how many people come through The Escapist even anonymously (don't know why, I've just gotten that impression) and it might have something to do with how they gather this information.
#3: PC-Cilin (I don't follow anti-virus software too much, but I'm guessing it's a small company) might for some reason have an axe to grind with this site. It wouldn't be the first time I've heard about programs that function with the internet doing wierd things when it comes to sites the developers don't like. Maybe the head of whatever company makes PC-Cilin got banned for trying to yell "first" in response to a Zero Punctuation and swore eternal vengreance or whatever and set his program to discourage people from frequenting this site.
In the end I admit I have no idea. I haven't heard about anything bad happening to anyone as a result of this site though, so generally I wouldn't worry.