• First, my websites are about natural widgets, this ad is about artificial-out-of-this-planet widgets... the ad has nothing to do with the content.
  
• Interest based ads are turned off, so I can't figure out why is this ad appearing
  
• I can't find out the url of the advertiser without clicking on the ad, the Firefox trick is not working.
  
• The Adsense Preview tool is not showing this ad or any info about it, so I can't block this ad
  
• I already blocked all the certified ad networks and the ad is still showing
  
• Being a very known international company I guessed the main URL and blocked it a week ago, it worked but the ad returned two days ago
  
• I changed the main preferences on my Adsense account to show only text ads, but this flash ad is still showing!
  
• I checked my code and is all ok, no hacking on my pages
  
• Is not a cache problem
  
• Is kinda hard to check it because I can confirm my sites show diff ads depending on the browser and computer [same page], but this time the ad is appearing on the same spot everytime

Any help would be appreciated