boborg,
Are you using Cute Editor modifying the server side code?
If so, please set Editor.AllowEditServerSideCode Property tp true.
Editor.AllowEditServerSideCode Property
By default Cute Editor doesn't allow edit the Server side code. When this property is set to true, Cute Editor will allow edit the Server side code. (<%@ Page Language="C#" %> <%=MyString %> <asp:textbox id="textbox1" runat="server"></asp:textbox>)
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