Hi,
After upgrading from VS2010 to VS2012 user get a blank box with a [cancel] button (the [cancel] button does not do anything.
When trying the same action for a second time, they experience no problem and the editor works fine.
VS2012 ASP.NET 4.0 IIS 7 Windows server 2008 R2
<asp:TextBox ID="LogboekTextBox" runat="server" Text='<%# Bind("Logboek") %>'
TextMode="MultiLine" Width="95%" Height="20em" /><ajaxToolkit:HtmlEditorExtender
ID="HtmlEditorExtender1" runat="server" TargetControlID="LogboekTextBox" EnableSanitization="False"
DisplaySourceTab="False"><Toolbar><ajaxToolkit:Undo /><ajaxToolkit:Redo /><ajaxToolkit:Bold /><ajaxToolkit:Italic /><ajaxToolkit:Underline /><ajaxToolkit:StrikeThrough /><ajaxToolkit:Subscript /><ajaxToolkit:Superscript /><ajaxToolkit:InsertOrderedList /><ajaxToolkit:InsertUnorderedList /><ajaxToolkit:RemoveFormat /><ajaxToolkit:ForeColorSelector /><ajaxToolkit:InsertHorizontalRule /></Toolbar></ajaxToolkit:HtmlEditorExtender>