Shoutbox

First of all, you can't login if you are on the server that runs PlusRemote.
Second, to find out who typed it it searches through all contacts in your list and checks if they have the same name as the Origin (who typed it), so Chat-Only-Names don't work.
Third, the one running PlusRemote may not have custom names, to make sure a contact doesn't have a custom name, select the contact, press F2, backspace and enter.

Hopefully this helps you out