JohnNZ - 11:27 pm on Jul 31, 2012 (gmt 0)
Not sure if this helps with your issue JCKline but here's a quote from [support.google.com...]
If you're using link units on your site, unmatched ad requests might be higher than expected. This is due to the way we count a matched ad request for link units. A matched ad request for a link unit is only counted if the user clicks on a term in the link unit. If the user doesn't click, the ad request is considered unmatched. As a result, coverage is lower for link units than other ad units.
I have a pretty high number of unmatched requests but I have adlinks on every page of my main site so I would expect it.
Did you add adlinks recently?