I have been noticing that adsense has not been showing my backup ad when it does not show an ad. I can see in my logs the page shows 7-8 times more then google is showing ads. can anyone shed some light on this issue? I feel I am loosing quite a bit of money from this.
An url would help.. But anyway, myself I'm not putting any backup ad, I just use the color or the "collapsible ad unit" script they give in their help page.