I was having an issue recently where the Google AdSense site was not rendering properly in Google Chrome browser. At times it would display the plain HTML with no styling. At other times it would display a simple message: “View in: Classic | Low bandwidth”. Finally I realized that I had AdBlock installed! Disabling it for the site made the AdSense site render correctly. I don’t know why it took so long to occur to me, but if anyone else has the same issue, hope this helps.