I am using the most recent version. However, I have managed to prevent the error. One thing I did not mention (did not think it would matter), is that the Chart is encapsulated on an inherited panel control. I added a panelGraph.Refresh() call to the event handler that removes and reloads the shapes...

Received the error with the message 'Index was outside the bounds of the array'. My application is unable to trap the error and closes. The top of the call stack is: TeeChart.dll!Steema.TeeChart.Styles.ValueList.this[int].get(int index = 1) + 0x21 bytes TeeChart.dll!Steema.TeeChart.Styles.Series.Cal...