Apparently there’s a glitch with the item “Crazy Nights” (haven’t heard of it happening with any other items)—you can’t add it to your cart, and if you add it to your wishlist the wishlist won’t work.
For now, the workaround is to go to your Account Dashboard, which shows your 5 most recent wishlist items. Move them to your cart, then refresh the page to get the next 5, and so on until you can delete Crazy Nights. Then your wishlist should work and you can move the items from your cart back to the wishlist by checking all the boxes and clicking “Update shopping cart”.