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Hi Ralph, As Gaston mentioned, it's very, very possible—probably, even—this what you're seeing is a result of this month's somewhat smaller index (161 billion vs. 92 billion URLs). I'd really recommend this Rand post on PA/DA fluctuations, along with the ones Gaston has already mentioned. A PA/DA of 1 almost always means we don't have information on the URL in question in the index. If the sites linking to you weren't indexed, then it's likely your site wasn't, either. It's very likely that your site will be back in the index after the next update.