Do you use XHTML DOCTYPE on your page with RadEditor? If not try with the following one:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Are you able to reproduce the problem in the live demos
of RadEditor too?
If you unable to find the reason for the problem, please isolate it in a simple working project and send it for examination on our side via a support ticket.
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