Not sure what you mean by Scrolling Through. It is normal to Scroll through your images while in Loupe View in the Library module and the cursor is in the Loupe View area. Has been for as long as I can remember. Every click of the scroll wheel will take you to the next or previous image. If you are in the Develop or Library module and the cursor is in the filmstrip area then the scroll wheel just scrolls the Filmstrip without changing the image.