I have managed to find a way around it. If you create the gallery and then include no images at first.. then you save the gallery.
Step 1: Create the gallery and include no images initially
Step 2: Save the gallery
Step 3: Go back into the gallery, and add 1 image at a time
This way it does work and you get the images to display instead of the helicopter thing.
Its a bit painful to put all the images in, but its a solution for now.
And as i finish typing this I see Vereart basically just said the same thing haha