Something that has come up with several clients of mine is an issue since IE8 has come out. Mysteriously Google Ads are not showing up. You can do a Google search and find several people asking what happened.
Well what I have found in many cases is that IE8 is more strict with html, xhtml and java script standards than previous IE versions and other browsers.
It appears that Microsoft is finally trying to say if you want common general public standards then we will do them to the hilt.
So if you find yourself in this problem double and triple check your code for compliance and you don’t have missing tags or incomplete tags near or around the Google Ads JavaScript.
Now this does not solve the funny way that IE8 wants to display some of the generated JavaScript. That is another issue altogether.