Erratic display of Adsense ads on multiple sites

Ads either not showing at all or displaying generic or off-topic.

[termcder]

I manage multiple websites and have AdSense ads on all of them. Lately, on at least a few of them, the Adsense display has been really disfunctional. Sometimes one ad will display, like a 728x15 link unit and two other text ads will be completely blank.

I have contacted Google about this re: another site and they responded telling me that they had fixed the problem. It wasn't me or my site. Any idea what is causing this on their end and how widespread it is?

My revenue is all over the board and it is due to the ads not showing. Is it just me or does anyone else monitor this?

[24fan24]

Did u tell google to fill a blank color is there are no relevant ads? (i.e. alternate ads)

[termcder]

The categories I am in have always been loaded with relevant ads. There should be no problem there at all. What I thought was interesting was that when I contacted Google before they indicated that they had fixed it on their end. I just wonder what the issue is.