Hi scorp,
One possible cause for this behavior may be the sampling. For more information on this feature, please refer to this article:
http://www.telerik.com/help/silverlight/radchart-features-sampling.html
You can set the
SamplingThreshold to 0, to see if the data is available. If it is not, you can open a formal support ticket, and send us a small working project, for additional review and testing.
Kind regards,
Yavor
the Telerik team
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