Ads doesn't show

Why?

[nervo]

Can anyone explain why Adsense ads doesn't show on some of my pages?
The code is the same on all of my pages but it seems some of them could not display ads.
What could be the reason?

Thanks all!

[leveldisc]

I've had similiar problems previously. There were cured by clearing the cache / temporary files.

[nervo]

I tried clearing my cache as you suggested but without success with those invisible ads...

[somerset]

One tip though I have found is to use the firefox browser and ads show all the time.

[Naty]

I mail to ask google they answer

Thank you for your email. I understand that you are interested in
viewing
an ad which previously appeared on a website participating in the
Google
AdSense program.

Unfortunately, we are unable to manually retrieve ads which no longer
appear on a publisher's website. Google AdSense uses technology that
determines a web page's meaning and serves ads from our pool of AdWords
advertisers that are relevant to that page at that moment.

For additional questions, we suggest you visit our AdSense Support site
at
[google.com...] . If you're unable to find an
answer to your question on our site, please feel free to reply to this
email.

Sincerely,

Courtney
The Google AdSense Team

[nervo]

One tip though I have found is to use the firefox browser and ads show all the time.

I use both Firefox and IE but that doesn't help...

Nate, their answer offers nothing, don't you agree?

[Sanenet]

How long has the code been up on the pages? Have you looked in your server logs to see if those pages have been viewed by the Google Mediabot?