A couple of days ago MS 10 Photos stopped functioning correctly. The first sign of this malfunction began several weeks ago when it started taking a vey long time to open and now I cannot scroll through photos backwards and forwards: there are no longer arrow indicators either side of the photo . I have tried reinstalling Photo: no improvement. The only thing that works is to group photos together and then right click one: then the scrolling arrows reappear and I can scroll. But this is not how it was previously. Of course, I could do a system restore as a last resort, but why do this if there is asimpler and less time consuming way of getting Photo operate as it had done before?