Hello Andrae,
We had some issues with RadEditor control that comes with Telerik.Web.UI_2009 builds. The options that I could suggest are
1. Try upgrading the Telerik.Web.UI dll with a newer version using binding redirect
or
2. Try upgrading Sitefinity to a newer version like 3.7 SP4
or
3. Try turning off
ConvertToXhtml filter of RadEditor. You can see how to do that in this help article:
Content Filters.
Regards,
Ivan Dimitrov
the Telerik team
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