The crosshair of the DatapointCrosshairTool is not shown when data are displayed on transformed axes. Disabling the transformation brings the crosshair back. See the attached project to demonstrate the error.
Another (minor) issue occurs in design mode, for example in the "tools" demo: Open the design editor of the ChartToolset, and try to rearrange the tools by clicking on one of the arrow buttons. The editor will throw an exception "Invalid argument index in format "%s Index %s ...". The same happens in the ChartTransformations design editor.