Did you ever figure out how to get two google ads to appear on your site at the same time. I am seeing the exact same problem that you are seeing.

What I have noticed during my testing to figure out this issue is I have gone to other sites that have dual or triple ads working properly and copied the google adsense code to a static webpage on my server and copy an identical copy to my Desktop.

The desktop version renders all ads fine in a browser and the exact same static page from my server will only render the first instance of the google ad using the exact same browser.

This is just a follow up to my last inquiry. My second set of Google ads began to appear without my intervention. It turns out on my page it looked sleazy having more than one ad per page since the information on each page is so sparse now. When I get more data per page I add the another Google ad to each page