In the past week I've added an Adsense field after the first post in my phpbb2 forums, and added mod_expires to my Apache2 web server. Since doing that my Adsense ads began losing relevance and now I've pretty much only got public service ads showing up. My Google Referral ads seem okay, just the Adsense going goofy. I'm wondering which change may have triggered this?
Hmm, I was playing with this problem and excluded javascript from being browser-cached by adding "ExpiresByType application/x-javascript "now"" to my mod_expires settings and the ads are coming back I guess Adsense doesn't like being called from the client side or something