http://www2.terriscope.fr/geocache/tms/1.0.0/truemarble@WGS84 returns <TileSet href="http://www2.terriscope.fr/geocache/tms/1.0.0/truemarble@WGS84/18&quot; units-per-pixel="0.000005" order="18"/>

The units-per-pixel at that level has not enough significant figures to be used, whereas at order="0" it is OK. It should be at least 0.0000053644180

The effect is that the GDAL WMS driver doesn't compute correct raster dimensions and emit invalid queries.

Example of a site that works better : http://tilecache.osgeo.org/wms-c/Basic.py/1.0.0/basic

This issue was closed by revision r285.