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Hi Sam, This is a different problem from what was reported in October. If you go to your PRO dashboard, there's a section for known issues, and there's a link to our post at https://seomoz.zendesk.com/entries/22457872-keyword-difficulty-and-rank-tracker-issues explaining the current status. We're also keeping people informed on the Help Hub home page, our Facebook page, and our Twitter stream. Feel free to send us an email at help@seomoz.org if there is anything more we could help answer.