I absolutely love Wizards 101 and am addicted. The game is full of wonder and amazement. For some reason I have been trying for over three hours to play today and still have not been able to enter into the game. I had one day off from work and would love to have been able to enjoy it, however it seems as if this will not be a possibility. I hope in the future the problem can be resolved.
Its because they disabled logins for a bit today while the folks who were fortunate enough to log on BEFORE they disabled it, to download the new content for Celestia's live debut. You should be able to go on now.