If you upgrade to the latest build, this issue should be resolved.
If you don't want to upgrade, please follow the steps below:
Please open CuteSoft_Client\CuteEditor\Dialogs\InsertImage.aspx and modify the following code:
<CE:Uploader id="InputFile" runat="server"></CE:Uploader>
to:
<CE:Uploader id="InputFile" runat="server" UploadType="Iframe"></CE:Uploader>
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