The CBS.com video player requires that you see an ad served by doubleclick.net before you can watch full videos. If you are having problems viewing videos on CBS.com, then I recommend you disabling any software feature that blocks doubleclick.net from serving that advertisement.

In my case, I had blocked doubleclick.net at my router. To view CBS videos, I had to permit the ad to be served.

The reason seems to be that the CBS player integrates the ad, so that if the ad doesn’t play, then the start of the video will not trigger. This appears to be different than some of the other network sites, where you can block their ads while the featured video still plays.

I haven’t looked into a way of still blocking the ad served before CBS videos, but I suspect it can be done. Perhaps the ads could be blocked in Google Chrome or Firefox with some javascript modification while allowing the featured video.