Then turn off Adthwart. I've been hearing from a few people that they can't see the ads on their blogs and this was the reason. Also, Adthwart blocks most of the things on the Adsense website. I didn't realize this at first but it cleans up the website if you have it off.
Use Google Chrome? Don't have Athwart?
Get it here!
Don't use Google Chrome?
What the hell is the matter with you?