Can't expand Custom Links box in Appearance => Menu See link
closed as not a real question by toscho♦ Apr 9 '12 at 0:28
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Can't comment yet I think, so i'll ask here, are you loading a custom version of jQuery? If so, try loading it on the pages you're targeting.
Had a problem not long ago, couldn't rearrange the menu items due to my deregistering jQuery and registering my own.
Since I used it on the frontend, I simply added :