Same thing for me today!

If you're already infected with Antivirus malware, then a lot of pages that you visit may be redirecting to any site...however...

if you find that a specific page on OB triggers this, please send me the link so I can investigate further

I don't think there is a specific page on OB Marty. I got it once on a certain page, then not again when I went back later. That's why I suspect something in the adds rather than on OB.

My machine is clean and my Antivirus caught whatever it was before it infected me (I've also done a full system scan since to check).

One instance I had was when I was on OB here on my home PC. The second one yesterday I was browsing OB during my lunch break on my work PC and the same trojon was picked up by the antivirus there. It's the same antivirus package here and at work, but at work it is set up differently and my PC reported back to the server rather than direct to me. My hubby as the server administrator told me about it in the evening.

If I get it again I will try and make a note of which adds are showing at the time, but hopefully Google will spot whatever it is and block them until they get cleaned up.

if something it would have to come from OpenX...which is weird - that's a huge company serving billions of ads. That's whom we use to server OB sponsor ads

unfortunately, that makes it a prime target for hackers. if somebody hacks a single ad server (or more rarely, pays for ads on one) they can distribute their malware through every site served by that server. a couple years ago, there was malware being served up by the ads on msn, which gets millions of hits every day. just goes to show that no site is immune to this sort of attack.
unfortunately, i've had to block a couple of major ad services due to regular attacks.

3 times this week I've been attacked by this malware. 2 different computers at work and now at the library. It happens to me on the OB home page pretty much as soon as I get there. It was the first site I visited on each occasion.

There is a malware/ virus program that sends emails with someone you know name in the from and subject is blank steals your email addys and puts the malware /virus on your machine if you open them .
I have a really good spam trap thru my ISP if not in my friends list it ends up there ,(except a couple of times is has gotten thru the spam trap . I do not open them .
Could it be the progarm is already on the machines before coming here from infected e mails ? I have not had a problem and ran a lot of scans .. Just random thoughts ..

Me too. My anti-virus program just caught something. I'm getting off of here.

I have also had a virus pop up blocked , i have not been here for a few weeks and this happened on OB start up.

can you post a link to the page when it happened? was it during reply, pm or just opening the forum? can you note the ads that are on the page ?