Hmm it appears one of my sites was blocked.. I think. Two days ago I had the same problem where it only showed on pages of one of my sites not on the home page. Now my top earning site, $10 a day wont show them at all but it did early this morning. 600 pageviews on analytics but only 300 impressions on adsense, meaning halfway through this morning the ads stopped working. Any way of telling if they blocked it? I've had them running for a few weeks now.
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if it was blocked, you should hear from google sooner or later. but if you wana check, use "adsenes preview tool" to see if the ads are loading in the tool. if it shwos some code starting with "e" then your site is blocked from adsense http://www.google.com/adsense/support/bin/answer.py?answer=10005