The page I had linked into the "iframe" contained a Google AdSense banner. This stopped all AdSense appearing on any of my pages.
Deleting the experimental page from my site directory restored my AdSense ads on my other pages.
Found this on Google:
The AdSense code was placed within an IFRAME.
Our targeting technology is not optimized to serve ads within an IFRAME. If you placed the AdSense code in an IFRAME, your site may display less targeted ads or public service ads. For better results please implement our ad code directly into the source of your web page. Once you make these changes, relevant ads may not appear immediately. Until we are able to re-crawl your site, which may take up to 30 minutes or more, you page may continue to display untargeted or public service ads.
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