If I understand correctly, Google Chrome itself is not detecting malware on the site. It's a web browser, not a malware program per se. Google has visited the site with some kind of web crawler and detected something untoward (it's detailed in the diagnostic page which you can view by clicking "Advanced" on the warning page.) They have flagged the website (through DNS?) and the warning page will pop up when Chrome users try to visit.
That my anti-virus/malware is not giving me alerts on my PC is some comfort, but that may simply be that I haven't visited an infected page on the site. And I believe the site consists of more than 8000 pages.
Chrome has about 16% of the browser market now, so I think this is a pretty serious issue. However the flags were set, and whether or not there is currently any malware issue with UE's servers, this has got to be hurting traffic. I don't know where UE's revenue comes from, but a drop in traffic can't be good for anyone. Obviously, a lot of people have chosen to ignore the warning flags, but who knows how many have simply stopped visiting the site?
I can't remember getting a similar warning about another website. I tend to take Google's word on this. I don't think they're infallible, but I trust Google as an internet authority. I imagine a lot of other Chrome users do as well.
I have no experience in running a website, but I would be making it my priority to get a clean bill of health from Google and to get the warning flags removed. I have absolutely no idea how to go about doing this, however.
Please don't take this as ingratitude or bitchiness on my part. I appreciate the work of those who operate this site (doing work that I only vaguely understand), and my only interest is in seeing this problem go away.