kev mc,
Can your client reproduce the problem in the following page?
Which verion of firefox are your client using?
Can you reproduce the problem by yourself?
Maybe you should try a simple configuration first.
<%@ Page validateRequest="false" Language="C#"%>
<%@ Register TagPrefix="CE" Namespace="CuteEditor" Assembly="CuteEditor" %>
<html>
<body>
<form runat="server" ID="Form1">
<CE:Editor id="Editor1" runat="server" ></CE:Editor>
</form>
</body>
</html>
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