I'm not sure if this was discussed on other threads, but based on my search it didn't. I can see the google ads, so is my friend, so is etc.. I tryed today from another computer, other ISP, it doesn't display, gives no error (like 404) it just doesn't display.. I asked a friend from UK he can't see any Google Ads, I asked 1s after another guy, he can! How do you explain this, I'm pretty sure it's not geo targeting..
Might be a Firefox extension that specifically blocks adsence adds. Ive used it before. Most people do not have it installed though.
If you are using blogger then I will just point out that sometimes their Adsense widget is anoying. It takes quite a while for it to show but you see the space where it would be if it did show.
I too am having trouble with ads showing up. Under IE ads show just fine, under firefox (no extensions) the ads do not show up. However if I create a blank html file with only google ads they do show up. I can replace them with yahoo ads and they work just fine. Any thoughts?
I had same problem and posted it here is DP. What I did is formatted my C drive and reinstalled the FireFox.
ads are javascript javascript can be disabled in any browser some people do so for fear or without knowing hence if some PC/browser show NO ads - FIRST verify that browsers javascript settings!!
for mozilla firefox check: >edit > preferences > content > ENABLE JavaScript !!! ALL known browsers have such settings somewhere in the preference section to disable / enable javascript it might be possible that after a new isntall OR a major UPDATE such settings may be reset ... and tjs disabled = hence google ads NOshow .) whenever there is something wrong/NOT working with such a major piece of SW like firefox - always FIRST assume that you have done something wrong in your configuration or handling of THAT SW.