Im using PS CC I have an image that has 20 layers and I have merged all into one new layer and once the layers are merged the saturation of all of the warm colors is significantly reduced. When I try to add saturation into the image or adjust the curves once the image is flattened the preview shows the adjustment but once ok is pressed the image does not look like the preview window. This is the first time something like this has happened to me in the 16+ years of using photoshop. Any way around this or any idea of how to fix this issue. The image has 10 to 15 hours or work into it and I really don't want to start over.