mod_tile help needed

Hi all

Newbie here. I have followed the excellent tutorial

and have a tile server working with an extract of Luxembourg loaded from

My basic OpenLayers page works and is displaying a map of the world at level 0 from http://myserver/osm_tiles2/0/0/0.png. However I can’t figure how to render the rest of the tiles including Luxembourg. When I zoom down the levels no map data is shown.

Any pointers gratefully received.