Maybe they are having money problems. I'd be weary of the smaller networks in a world recession. Yahoo themselves are having advertising issues. Its like 2001 all over again.
Claria just closed up shop a couple of weeks ago, and they were much bigger. Times may become tuff for us soon with all these networks. Weeding out the strong ones may be tough.
CPX has been paying me properly since October 2007 (yes 1 year so far). I admit sometimes they are a few (2-3) days late on payments. But they ALWAYS pay.