I am using mapnik stable and am experiencing a strange bug with shield
symbolizers. I wonder if this is already known, and if others
experienced the same issue.

Sometimes (actually rarely) the label-text of a shield label is moved
outside the actual shield. This happens only rarely and the same rules
create mostly valid shields. I am rendering single (test)-tiles with
generate_tiles and set the buffer to 350 pixels (tile size is 256),
maybe this is connected?

See an example here (in the lower right corner is the empty shield,
the text is left from it in the center):
http://img703.imageshack.us/img703/3912/759e.png

Another issue you find as well in the standard OSM-Mapnik rendering is
that the text is not always vertically centered (sometimes it tends to
move slightly down, sometimes it fits perfectly, in the same
rendering), e.g. see here:
http://b.tile.openstreetmap.org/11/1102/763.png
http://c.tile.openstreetmap.org/11/1104/761.png

cheers,
Martin
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