Have you tried viewing the album directly? You can do so from the main game screen - click the icon that looks like a photo book (to the right of the Zoo Fame stars). Looking at the album will also show you how many pics are "on" your camera.
Have you installed any UCIs or hacks?
Have you made any other changes to your computer (ie new graphics card, new software, etc)?
Either of these may be creating a conflict either within the game (UCIs/hacks) or between the graphics card and the game (new hardware/software).