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Hi Rob, The On-Page report is a timed report. It's pulled Weekly automatically. You can run a report here: http://pro.seomoz.org/tools/on-page-keyword-optimization/new to do a cursory evaluation of your On-Page on the fly. If it's within a few days of your last crawl it is possible that it will pull cached data, so please keep that in mind. I hope that helps! Cheers, Joel.