FYI this bug recurs whenever there's a lock icon over the save buttonHahaha thanks, you have just found a bug that we didn't know we had
You have to play through the tutorial and accept your first guest once she checks out you will be able to make a save and it will load every time
The reason yours doesn't work is that it's being made during the introduction
You can still click on it and make a new save, but it only loads a blank screen, and the only way out is to kill the game and restart it.