The exception is "FormatException: String was not recognized as a valid DateTime"
The issue is fixed in build 2010.1.526 and later. A workaround is to include the following script below the ScriptManager/RadScriptManager instance on the page:
<script type="text/javascript"> Telerik.Web.UI.RadScheduler.prototype._onDateHeaderClick = function (e) { $telerik.cancelRawEvent(e); var date = new Date(); // Date headers have an href in the format #yyyy-MM-dd var dateMatch = e.eventMapTarget.href.match(/#(\d{4}-\d{2}-\d{2})/); if (dateMatch && dateMatch.length == 2) { var parts = $telerik.$.map(dateMatch[1].split("-"), function (part) { return parseInt(part, 10); }); date = new Date(parts[0], parts[1] - 1, parts[2]); } return this._switchToSelectedDay(date); }; </script>