I create a new layer add a gradient overlay and try to click on my gold gradient, click it, click ok, and its showing up that default grey, black, white one. It was working just fine a few days ago now all of a sudden it doesn't work. Can anyone please help me?
Without proper system info and details about your document nobody can tell anything. The behavior may indicate that you are in the wrong color mode or use a specific layer type or layer blend behavior that interferes with the gradient overlay...