Please upgrade to 2.3 here.
The 2.2 and earlier branches are no longer being updated.
[Solved] Re-ordering of Categories not working
I am implementing a custom theme for Vanilla using the EmbedFriendly theme as a basis. I have added a number of categories in the Dashboard but I am unable to order them using the drag/drop interface.
All of the core js files have remained untouched so I am unsure as to why this isn't working.