Calendar PopupPosition Ignored

Hi,

I am trying to use a CalendarExtender, with the latest version of AjaxControlToolkit.dll for VS2010 installed - 4.1.7.123.  It all works fine except the PopupPosition property is being ignored.  This worked fine with previous versions of the toolkit.

The problem occurs in IE9 in both Compatibility and native mode, and also in Chrome and Firefox.  I am using the exact same calendar.css as with the previous version.

The code is below.

Thanks.

--Dan

<asp:TextBox ID="txtCheckInDate" runat="server" CssClass="TxtFld" Width="70"
   AutoPostBack="false"/><asp:ImageButton ID="ibCheckInDate" runat="server"
   Height="18" Width="18"
   ImageUrl="~/Images/Calendar18x18.gif" ImageAlign="AbsBottom" /><ajax:CalendarExtender ID="ceCheckInDate" runat="server"
   CssClass="cal_Theme1"
   TargetControlID="txtCheckInDate"
   FirstDayOfWeek="Monday"
   PopupPosition="TopRight"
   PopupButtonID="ibCheckInDate" />