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Subhuman - 9:12 am on Nov 7, 2007 (gmt 0)
a) keywords that sat number 1 with great quality score and £0.03 minimum bid suddenly dropped to the bottom of page 3 or 4 overnight. b) the error message mentions anything to do with targeting
As much as I apprecite the suggestion of using the Ad preview tool, this doesn't explain why either: