So glad I found this thread as I am getting this to (in the UK) - only when using IE, and only when logged in to my account. Both home and work PCs, and bother have been scanned with different up to date software and reveal no viruses on my machine.
2013: Not flown anywhere. And work too crazy to spend much time on FT. Am a rare visitor here these days...
I get it (1) only when on IE, not Chrome; (2) whether signed in or not, makes no difference; and (3) when clicking on several FT forums, including this one and including OMNI, also the "Dining" forum in "Travel & Dining."
So for me, the two consistent factors are IE browser and FT website.
Had this problem again today again using flyertalk.com/forums (IE)stored in my bookmarks. I have not had the virus alert going forum to forum.
I dont even see the Flyertalk banner load and I get the virus alert. The screen comes up white with the alert - no ads were clicked. It looks exactly like the pic I posted earlier in the thread. (I dont know how to do a full screenshot. Sorry.)
Today the address in the bar is some place . pl again. I tried right clicking and nothing happens so could no provide you the page source info requested.
Task Manager used to close the page. Task manager actually shows Flyertalk running and the IE page with virus alert running although I dont actually have a visible page of Flyertalk.
Ran malware and virus protection software. Always comes up clean.
Must say this is getting annoying. Makes me have second thoughts when I think about coming here - dont want to risk a virus/trojan etc.