The [Xplr] button only disappears if you don't have paperport configured. Otherwise it should be visible. Let me check ...
I dont use PaperPort. I use [Xplr] PaperPort and Xplr are entirely different things. Everyone can use Xplr, regardless if they have paperport or not.
Works for me If there is nothing for settings/user/paperport/patient directory, then the pport and xplr buttons disappear. If something is there, then they both stay visible.
Hmm. Your settings work for me ... must be a different server issue. I'll upload the server build ( 5 ) I'm using.