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	$ FC_DEBUG=256 fc-cache -f .

That should dump out lines starting with 'found name' that show fontconfig
walking through the available names in the font.  If the style names do 
appear, post the output for the relevant font files to the fontconfig
bugzilla (http://fontconfig.org/bugzilla) so that the underlying cause 
might be found.  If the style names don't appear, then your font files are 
either broken or FreeType has a bug.

Keith Packard        XFree86 Core Team        HP Cambridge Research Lab