Navegation through the gallery's pictures allways showd the first picture.
i've tracked down the error to the class rsgInstance.
unluckily i'm not very familiar with RSGallery and PHP, so please forgive me any mistakes :-)

   function getGallery(){
      $gid = rsgInstance::getInt( 'catid' );
      $gid = rsgInstance::getInt( 'gid', $gid );
      
                // get gallery id from picture id if none of the above is supplied
      $itemId = rsgInstance::getInt( 'id' );
      if(!$gid && $itemId)
         return rsgGalleryManager::getGalleryByItemID( $itemId );

      return rsgGalleryManager::get( $gid );
   }


   function getItem(){
      $id = rsgInstance::getInt( 'id' );
      $start = rsgInstance::getInt( 'start' );
      
      // use value from navegation link, if it is supplied
      if( $start ){
         $items = rsgInstance::getItems();
         return $items[ $start ];
      }

      if( !$id ){
         // there is no item set, return the first value from getItems()
         $items = rsgInstance::getItems();
         if( ! $items )
            return null;

         return array_shift( $items );
      }

      return rsgGalleryManager::getItem( $id );
   }

john

Joomla 1.5RC2
latest PHP/MySQL
IIS6

If this is a solution that works, why not add it to the code, as part of a upgrade.

John, you are completely correct.  Pagination was initially started to take place in rsgInstance, but it actually doesn't belong there.  I've just finished cleaning up everything and it's all working in r266.  It's now handled very similar to the J1.5 preferred method.  The only thing left is moving from id to gid, limit and limitstart.  I will be taking care of that tomorrow and will update here again when it's finished and ready for testing!