If you create a page using the simple form, then try to edit using advanced form, you may get one of those crazy messages saying "the page could not be moved".
Try this:
- Go up to the address bar and change Special:AddData to Special:EditData.
It's worked for me at http://familypedia.wikia.com/wiki/Special:EditData/person_advanced/William_Forbes,_7th_Lord_Forbes_%281513-1593%29
— Robin Patterson (Talk) 12:27, March 7, 2010 (UTC)