I have 325 pictures downloaded on Adobe Elements. The last 200 only show up on the grid as an hourglass. I cannot see the actual picture on the grid and have to guess where certain pictures might be. The first 125 pictures show up fine on both the grid and when selected. What is the likely problem. When I click on one of the hourglass images the actual photo will very slowly appear but again the one before or after does not and the grid shows none of the last 200 or so pictures.