HELP!!!!

ok so this is my problem everytime i go here http://halo.xbox.com/en-us/Career/HaloReach/Challenges i cant create a challenge. like everytime i click create challenge the backgrolud stuff goes like a darker color and a blue box is lighted up a little but the box has nothing in it (the box is to the right of create challenge. please help

Did custom challenges ever worked for you?
Which browser are you using (IE, Firefox, Chrome, etc.)?