Wait until you hear from AdSense. Whenever I've seen a post from someone in a situation like yours (ads not appearing on one site), they have mentioned receiving a message.

(Check your spam filter to make sure that you didn't get a message--and check your account to make sure that you've got a current email address there for them to use.)

Where are you located? It sounds like you have a stop word or theme on your site that is preventing your ads from showing.

I am located in France. The site is in French.

Do you know if there are any web or Google regulations that would be particular to France? Seems like I heard once that there were, but I could be mistaken. At any rate, I think you're going to have to see what you can find out from Google, I'm afraid; nobody here is likely to know.

I've heard on a Canadian TV Channel of lots of ads and websites, especially blogs blocked but I don't know how deep is adsense affected.
You may want for a while or try to place a different add on a different site, and if you don't see how check out this short vid: [youtube.com...]

I came across your posting by looking what tlds are not showing adsense ads and I think .name is one of them

Did you change ANYTHING on your site during the past few days? Changes can include:
- server configuration changes
- robots.txt modification
- coding on the pages

It's amazing how many times minor changes that shouldn't affect anything else cascade out because of a minor issue.

Thank you all for your valuable feedback.

I am not aware of the specific adsense regulations for France.

The site is a sub-domain of a .net. My ads are normally displayed on the other sub-domains of this .net domain.

There were no changes in the server configuration, the robots.txt or the coding of the pages. However, content of some pages of the site is made from RSS feed, and therefore changes almost everyday.

One point I forgot to mention: I have adsense for search on the site, and it is no more working either. It gives the following error message:

"Google Error

Forbidden
Your client does not have permission to get URL /custom?domains=#*$! from this server. (Client IP address: #*$!.#*$!.#*$!.#*$!)

Nous regrettons de vous informer que votre demande n’a pas pu être traitée.
Veuillez cliquer ici pour poursuivre la recherche sur Google."