Hi,
Which code do you use ?
For the first connection, you have the choices between three modelling system : Telemac reflux and Rubar. I think you have activated reflux. If you want read a selafin file (telemac), you must activate the modelling system Telemac in the menu of the supervisor "Edition/Prefrences/modelling system". You must also restart your sessiosn to take into account your modifications.
I hope that this will help you
DR