essaye ça: http://www.sleepywood.net/forum/showthread.php?t=1299997
sinon ça: I found a fix for the problem, actually. Click on the network icon on the bottom right of the notification area, go to "Open Network and Sharing Center", then go to the left and there will be an option that says "Change adapter settings" and disable the Microsoft loopback adapter. Hope I helped.
sinon : réinstalle. Essaye de lancer maple et seulement maple en virant tout autre procéssus inutile (essaye également de le run en tant qu'admin).