[OSM-newbies] Tirex/Mapnik does not deliver all tiles

[fatzopilot]

Working through the docs in the wiki, I finally got a mapnik/tirex stack
(on-demand tile generation) up and running except some showstopper:
Some tiles are not delivered by mod_tile. E.g.
http://tileserver.myosmserver.org/tiles/osm/1/1/1.png generates a meaningful
tile (and the corresponding meta-tile is generated) but
http://tileserver.myosmserver.org/tiles/osm/2/1/1.png results in a 404.
However, the rendering process is started in all cases but once it finishes,
the 404 message is returned and no (meta-)tile is generated. 
http://tileserver.myosmserver.org/tiles/osm/10/1/1.png works again but just
shows an empty tile, i.e. ocean.
All tirex test run successfully and mapnik is able to generate a map of GB
(generate_image.py). Generate_tiles.py also works flawlessly and meaningful
tiles are generated, e.g. /var/lib/tirex/tiles/osm/15/16356/10991.png.
Trying to access it via
http://tileserver.myosmserver.org/tiles/osm/15/16356/10991.png again results
in a 404. Mapnik 0.7.1 and Tirex 0.5 (latest svn) are both installed from
self built packages and run on Ubuntu 10.04 (64).
Any clue what could be the problem here? Hints welcome!

Thanks
fatzopilot
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