When I changed from an open box to a closed box my cat thought it was a new bed for her and slept in her litter all night and all the next day.
Then later on I tried to change the type of litter well she made a point of pussing all the litter out the door of her box on to the floor. I guess she didn't really like the new stuff at first but I put all the litter back in and she never had a problem with it again. (while I was putting the litter back in the box I got a few angry kitty stares )