What phone and what version of Android are you running? Are you using a different program when you take the pictures? Or maybe you've changed the default folder for the pictures? No secondary folder (like on mine there's a second folder under DCIM labeled Camera where the pictures are)? Maybe you have so many pictures that it just takes a while for them to show up? I didn't have many and yet the folder with them in it took forever to actually load them all so if you have a lot of pictures maybe its hung up trying to load the previews or something?