First, I want to say that I love this game (and UBM I bought at the same time). I had played the demo (version 1.1 for the record), and I had run into this bug before. I upgraded (just downloaded 1.2.1?--newest version onto it) the game, and I still get the same bug.
The bug is that once a day one of my shows will totally blank (go 0,000) on one of the 4 demographics. The total will be more than the remaining 3 demographics so that one group is watching the show. I am just not getting credit for it. Normally, this wouldn't be a problem if either it was a predictable show or time AND the demographic was consistant. It is frustrating to have a targeted ad fail just because that was the time the bug hit that demo.