Android ADs by admob problems

I have developed application called "TV Spored ++" actual for Slovenian users. I have tested it on few devices before adding it to market. It worked well more or less on all tested devices. Today开发者_Go百科 I have tried it on Galaxy tab and noticed that ads are not showing.

Switching this device to test mode fore ads aRequest.addTestDevice(...); actually showed test banner.

I connected to the same Wi-Fi and tried to connect with Galaxy tab and Nexus S. Nexus S showed ads and Tab didn't.

What can I do?

I only get the what is shown on image below.