Since last tiles@home update there are Problems with Unicode rendering.
See:
Beijing:
http://informationfreeway.org/?lat=39.75820846018085&lon=116.57961649164565&zoom=9&layers=B000F000

Or in Laos:
http://informationfreeway.org/?lat=14.804513021757694&lon=106.78805367103163&zoom=9&layers=B000F000

I also tried to load the coastline data for South East Asia with JOSM - but no success.

What is wrong with that one:
http://b.tah.openstreetmap.org/Tiles/tile.php/11/1596/929.png

The next one in the south is ok.
http://b.tah.openstreetmap.org/Tiles/tile.php/11/1596/930.png

I named some streets in vienne. In mapnic my changes are still visible. With osmarenderer my changes aren't visible anymore.

What happens there?