Quick note: there are too many member reports for this to be a local issue at the visitor's end. It's here.
We know it's a local issue when there is only one report, or maybe a couple that are related to known browser issues or whatever. When there are multiple reports it's going to be here. Sometimes it's serious, sometimes it's just the latest update of an app that doesn't like a particular scrip or something.
When there are multiple reports but of varying issues - like now - then we know it's not just an update causing an exception, which is probably harmless; we know it is likely to be a problem and not a false alarm.
Because it jumps from page to page, it is probably caused by an infected banner advert.
Question is, is it just a minor issue such as 3rd party site linked on the ad target site, maybe just a crud site that's blacklisted for poor ethics; or is it a malware script-infected ad? Or something in between? We won't know till the advert is identified.
So - if you see a banner ad on the page that throws the AV message then please tell us what the ad is - thanks. Otherwise it may take some time to track down, as it means viewing every ad, on a computer known to trigger AV warnings with any level of exception detected.
Thanks.