Hi, Today I created a new ad in adsense. As Google says it could take 10 minutes before the ad will be visible on website. Even after 30 minutes the ad wasn't visible on my website so I decided to take a preview of it. And as soon as I previewed the ad, it started displaying on my website. Just wanted to share it with you. Thanks
The preview tool is just grabbing the AdSense that are located in the pool for your specific pages. Sometime Google don;t display ads because they don;t find them relevant or they don't find relevant ads for your country.