1. go to http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx or use any radEditor instance you have

2. switch to html mode and delete all html content

3. copy the following html code and paste it to the html mode text area.

<table width="100%" style="color: inherit; font-family: inherit; font-size: inherit;" cellspacing="0" cellpadding="0"> <tbody> <tr style="padding: 0px;"> <td style="padding: 0px; height: 20px;"> </td> </tr> </tbody> </table>

4.switch back to design mode.

5.copy the following html code: <p>TEST</p>

6. set cursor inside the table (you will see table border in design mode)

6. paste copied html using ctrl+v or paste command from editor tool bar

7. switch to html mode and notice that you have several &nbsp; added to your html