I am struggling with the problem on my Nikon D750 when trying to enable Multiple Exposure. I used it at some point in the spring, and got to liking it, so trying to do projects with it, but suddenly something happened and it is disabled. Trying to enable it at various settings in a camera, I get the error message like this "This option is not available at current settings or in the camera's current state" I tried at different settings, I did "reset shooting menu" All the different settings are tried are those that I usually / always use. It is very unlikely that when it worked, I was at some setting that I do not use usually. Can anyone help ?