Hi analysis,
Please create a simple page to try, like below
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<%@ Page Language="C#" Debug="true" %>
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<%@ Register Assembly="CuteEditor" Namespace="CuteEditor" TagPrefix="CE" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<title>Untitled Page</title>
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</head>
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<body>
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<form id="form1" runat="server">
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<CE:Editor ID="Editor1" runat="server">
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</CE:Editor>
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</form>
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</body>
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</html>
if it works on IE8, try to create an example can repoduce this issue and send it to me.
Regards,
Ken