Please delete the following lines in the file zp-core/full-image.php"
`/* Prevent hotlinking to the full image from other servers. */
$server = $_SERVER['SERVER_NAME'];
$test = strpos($_SERVER['HTTP_REFERER'], $server);
if ( $test == FALSE ) { /* It seems they are directly requesting the full image. */
$image = 'index.php?album='.$_zp_current_album->name . '&image=' . $_zp_current_image->name;
header("Location: {$image}");
exit();
}`
and try to access the bigger picture. If this works, we will need to know about the server setup. These lines, as the comment says, are testing to see if someone is trying to link your image from a place different from zenphoto.