I was working with him last night and his source is Lagarith, rendered out of Vegas. He was already using the latest version of Zarx264GUI as well. What's odd is that he was also having trouble rendering in VirtualDub, so it's probably a codec problem. Last I heard he downloaded the latest Lagarith version and reinstalled, but I don't know if that fixed the problem.
Think millionaire, but with cannons. || Resident Maaya Sakamoto fan.