I can reproduct it.
If I click "disconnect" button before close the browser , It have no problem.
So you can change this code if you want to fix as soon as possible :
The CuteSoft_Client/CuteChat/Channel.aspx , find the :
function window_onunload()
{
Disconnect();
}
and change to :
function window_onunload()
{
Disconnect(true);
}
I will try a better way later.
Regards , Terry.