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Updated AjaxControlToolkit to 188.8.131.52 and HTMLEditor.Sanitizer to 184.108.40.206 also. I see them in my project References. My program loads the TextBox with my HTML code and it is displayed fine. VB project Framework 4.0, Visual Studio 2013.
I've tried setting EnableSanitization="false" in the Extender, validateRequest="false" in the @Page (using VB).
What else can I try?