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---- Some time ad appear and some time not
htmlbasictutor - 12:57 am on Nov 18, 2011 (gmt 0)Thread source:: http://www.webmasterworld.com/html/4387547.htm
I would agree with SteveWh, if it's a third party ad (not just AdSense) there maybe be no ad available or the server where the ad is coming from is slow/stalled.
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