The channels usmle.net/step-2... usmle.net/step-3 etc work fine, but the channel usmle.net/step-1 has stopped working, it does not display the ads anymore. If I rename the file usmle.net/step-1/index.html to anything else, for example usmle.net/step-1/dummy.html then the ads display fine, so I know the code is correct.
The trouble shooter site from GOOGLE was NOT helpful (did not resolve the problem)
PLEASE HELP! THANKS !!!! Andreas