covalense,

Version 6.0 is out.  This issue is resolved in this new release.
 
It's a free upgrade.
 
Demo:

http://richtextbox.com/cs/

Download:

http://cutesoft.net/downloads/default.aspx 

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asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx