I haven't used my PPRuNe e-mail much, but that site recognised me and logged me in. No problems, and no apparent pop-ups.
However... all the pages had, somewhere on them in large print, the message
404 Not Found so I reckon the Adblock add-in to my Firefox (or one of the other protection devices) is doing its job.
If you're using Firefox, click on Tools - Add-Ons - Extensions - Get Extensions and look for Adblock. It's excellent.
While you're there, I'm also impressed with NoScript - which prevents Java being stuffed onto your machine. You can enable sites you trust, and block those you don't. A useful protection indeed. That might be what's blocking whatever is 404 Not Found.
I also use SpoofStick,which displays the name of the site you're really connected to (even if it's spoofing what shows in the URL window). Once, I thought I was on eBay, it told me I was on something entirely different
