Mutiplayer problems

Oups! Sorry. I posted this to the wrong forum!! Hi! For months, a friend and I use to fly mutiplayer once or twice a week through an FSHost site we meet at. For unknown reasons, the last time we tryed to join, he was unable to log its FS9 to multiplayer although he could into FSNav we both use. He could see me in its FSNav screen but could not see himself nor could I see him in my own FSNav screen. Besides, while theoricaly logged in FS9, he could not make the chat screen to appear after pressing 'return' key which is a supplementary 'proof' he is not logged at all.Since, he has delete and reinstalled FS9 an FSNav with no joy it seams. Tomorrow we should meet and will be looking to find the source of the problem.If someone has any specific points we should pay attention to, it would be appreciate.I've been flying multiplayer for quite some time now and am relativaly at ease with the environment but it's never a bad thing to know a little more, beside the fact we could overlook things that are realy obvious... after the facts ;-)Thanks for any helpHugo