No charts every time you run a report with a chart and you got this web page: As the message states the Office web components are not installed in your reporting point you can download them here: http://www.microsoft.com/download/en/details.aspx?DisplayLang
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Read the complete post at http://scug.be/blogs/lars/archive/2011/11/28/no-charts-in-sccm-web-reports-pffff.aspx