My Adsense revenue dropped from about $10 a day to 20 cents a day on March 1st and it has been consistently at that level since then.
The only change in the code from March 1st is that we had added an "iframe buster" by setting the X-Frame-Options
response header to SAMEORIGIN
Would that have had any effect on Adsense?
(We just noticed the drop today and have reverted that change to see if it has an effect)
X-Frame-Options
on top page shouldn't affect them. Do you see ads being rendered? Any JS errors in console?