Unfortunately I have not yet been able to get the space bar to move the selections I am creating with the marquee tool. The space bar will not move it. Is there a way to reset it? Bring it's functioning back.
That is correct. Hand tool pans the image. If you want to move the selection do as Johan suggests. If you want to move the pixels that are selected, hold down the Cmd/Ctrl key to change the tool to the Move tool and that will cut the pixels into a floating selection that can move the pixels around.