Hi,
I am not sure what's wrong now.
because I can't reproduce it on your website.
please add this into web.config and try again.
<add key="CuteWebUI.AjaxUploader.UseAspNetStream" value="True" />
and also , you can let the user test this page
it will show a debug trace box , when get error , please copy the text and paste here .
Regards,
Terry