The only think i can think of is that he has you on his ignore (enemies) list, which likely stops you from sending him messages (i really wouldn't know, because i have never ignored anyone, nor noticed that anyone has ignored me) but that would be my only idea.
(Cacher) Vous en avez marre d'avoir à cliquer sur 2 ou 3 liens pour pouvoir atteindre une même page? Les abonnés peuvent ajouter cette page à leur Menu Contextuel. (pauloaguia) (Montrer toutes les astuces)