so a little update here, I think who runs proxies might find it useful
I noticed that ritecounter code doesn't love adversal's javascript in some way, no popunders are launched when there's ritecounter's code on the page
apart from this ritecounter remains a nice stat provider, the nicest after statcounter imo amongst those I've seen so far
I tried to see if there was any problem surfing and after few pages that I noteiced a website launched in a globalinteractive popunder was cousing the browser to crash; this occurred 3 times in 3-4 minutes so, this might actually be the cause of the big drop in pageviews I've seen in the past days, moreover I have been warned of a troian sent from another GI popunder
I've swtiched back to adversal and have notified GI about this
I have google analytics running now so I'll have to wait some time to report back again

I hope this helps