Ok - I found that start++ worked after I logged out, and back in again, which doesn't make any sense.
The pic function needs some tweaking;
Images are not shown at their native aspect (unless they happen to be square) also images are not displayed correctly if they are corrupt, particularly if images have been continued.
Mostly this is due to downloading a small image, and then downloading a larger image into the same place, and writing the end of the large file to the smaller one, Windows decompresses the whole file, more sophisticated viewers only decompress the smaller image. I can send examples if need be.