I was receiving exceptions when attempting to set range at runtime on the range selector.
Message=Object reference not set to an instance of an object.
at Telerik.Charting.CombinedBarSeriesRoundLayoutStrategy.ApplyLayoutRoundingVertical(LayoutContext context)
So I stripped the form out of the main project and I've put it into a sample application. Commenting out lines 13 and 14 of FrmPerformanceChart.cs leads to different levels of nightmare.
Link to project is sample: testchart