I was advised by Casale they are dropping popunders by the end of the month? Any alternatives out there for that particular creative with a high CPM, and more importantly, "safe ads?"
What about Conversant (fastclick/valueclick)? I've had an account with them for like ten years. I don't us them these days, but maybe their pop unders still pay well? They seem to be one of the few upper tier ad networks to offer that tag. Everyone else I'm with does not.
Been using Popads myself for just under 3 months now, no virus's or malware ads, daily payout, $5 minimum, passback code for another pop network and amazing rates. They also seem frequent on here for any support. Great ad network, you should give them a trial at least. Propellerads are also a good choice.