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HI Akram, Rank Tracker was down between November and February while it was being rebuilt, but it has been fully up and running since February so it sounds like you may need to clear the cache and cookies in your browser if the system is still showing you the landing page. It is currently up and running and clearing the cache and cookies should let you access the new version of the tool. Chiaryn

We don't have a way to clear old reports, but the most recent reports should show at the the top of the screen. If this isn't the case for you, could you contact the help team at http://www.seomoz.org/help and they'll help figure out what's going on. Thanks!