We are unaware of any similar issues with the Chart demo examples and the control itself. Could you , please, share more details as it is very difficult to pinpoint what the problem might be based on the information you have provided. What is the difference between the machines on which it works correctly and the one where it does not, are the silverlight and Telerik versions the same, etc.
What we could recommend would be to uninstall the controls, delete all remaining files and make a clean reinstall. Hope this would help.
the Telerik team
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