Loading up the project all I see is a blue screen.  Tried changing camera modes resulted in same behavior.  When scrolling out I did see that it appears the only object that is visible is some water instance:

Looking into it more, the character, walls, etc are all there. I am able to move the player object using the arrow keys and see that the camera is following.  Nothing is drawn accept the water though.

Something strange is going on with opening/importing the project.  The sprites all exist and are visible in the gamemaker editor as well as in the room editor itself, but do not draw initially when running the project.  Opening each sprite and modifying it then saving resolves this issue and each sprite is then drawn when the project is run.  MacOS.

That's really strange. Did you try in a new project? I don't have access to MacOS I am afraid, but can refund your money if you are unhappy and cannot get things working.