This is my (constructive) way of protesting the new sandbox for riddles.
It's a simple alphametic.
You know the rules.
Each letter is a unique digit.
The leading digits cannot be 0 (zero).
If you offer a solution, please add your reasoning.

 SAND
+ BOX
-----
NOFUN

Since A & B and X & D can be switched and still keep a valid result, this one has 4 solutions.
I will settle for one.