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I've tried the google.blogspace.com adsense test tool and it only comes up for PSAs for the root URL. Does this mean that there's something in the code that is stopping adsense from providing targeted ads or am I just being impatient?
Could the bot be having trouble with how the content is delivered (ie. any dynamic URLs) Is your robots.txt is allowing the mediabot? These are the most common problems with untargeting ads. But it can sometimes take several days with a new site.
Is the mediabot showing up in your logs? Was this a site that was previously denied, but then accepted later?
It is probably time to drop AdSense a note and see what's up. It is possible that your content just might not be targeting any available ads.
I made some minor changes to a lot of pages on my site (to improve their appearance), and underwent much the same thing as you are now experiencing. Google gave the the two to three week figure in response to an inquiry. Ultimately I had to wait it out.
If you have added *new* pages, they should be spidered relatively quickly, even if you have to wait for the old ones to be revisited.