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Hi, It is a known issue with the on page grader (I get the same with Greek characters and there are reports on quite a few other non latin character sets also).  Might be worth adding the issue to the list here, I don't see it specifically mentioned. Not much help I know. The only thing I can suggest is using the grader report as a guide to make sure you you are not missing any of the major on page factors. To be honest I have never found these reports to be that useful other than as a quick check that I am not overlooking something obvious...