When using IE10 and a calendar control, the "forward" and "back" buttons on the control do not work properly. When the arrows are clicked, a screen with a loading, spinning, icon will appear and will not resolve unless the screen is refreshed.
Also, if debugging tools are active the following error will appear: SCRIPT5007: Unable to get property 'documentElement' of undefined or null reference
ScriptResource.axd, line 155 character 2
Two workarounds are available.
1: Use IE 10 in IE9 compatibility mode.
2:A modification to the Radtooltip can be made by navigating to: \workarea\WebCalendar\DefaultTemplate\Display.aspx and modify the telerik control to ShowEvent="OnClick".