Open the Rich Text Editor demo page in IE10 browser. Clear all the content in the design page.

Click the source tab.

Then move back to design tab.

In the content area of the design tab, make a click with the help of the mouse.
The cursor moves ahead of the content area. 

 Video is captured and available @ http://screencast.com/t/CzQLXH2i

Hi AlagappanAnnamalai,

The development team investigating this issue, once issue is fix, I will keep you posted.

Regards,

Ken 

Hi AlagappanAnnamalai,

We have fixed this issue, please download the latest build and try again.

latest build dowload url: http://richtexteditor.com/download/richtexteditor.rar

Regards,

Ken