This issue is resolved in the version 6.0. Please upgrade to this new version. It's a free upgrade. Demo:
http://richtextbox.com/cs/
Download:
http://cutesoft.net/downloads/default.aspx
asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx Web Messenger: http://cutesoft.net/Web-Messenger/default.aspxasp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspxasp 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