Comment 18 for bug 167151

I think you might need to rebuild some sort of cache or
index or something. There's fc-cache, but I think there
ought to be a distribution-specific way of doing it which
probably does a bit more as well (and that bit more might be
important).

Some Google searching refers to a Mandriva Font Installer
application which probably does the rebuild for you, but you
might need to use it to add or remove a font in order to
persuade this to happen.