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Have you added the HubPages URL to your adsense account URL channels?
If the account is active here on HubPages, you will earn from Adsense if your ads are clicked, but to actually see that this is happening you need to add the URL to a section on your Adsense account so that you can track/follow your earnings.
There are instructions on how to do this on this hub http://hubpages.com/hub/HubPages-Post-Publishing-T...
You can also add the URL of individual hubs to Adsense channels in your Adsense account if you would like to see which hubs your clicks are coming from.