Platform: Pentium M (Dell Latitude D600 laptop), debian sarge (testing/unstable), XFree86 4.3.0.dfsg.1-4, qt 3.3.2-0pre2, kde 3.2.2-1, fontconfig 2.2.3-1 When I came back from vacation, I did an "apt-get dist-upgrade" which upgraded a lot of packages. After this, my own Qt application has acted strangely. It prints out Fontconfig error: line 1: unknown encoding Fontconfig error: Cannot load default config file to the console when starting up, and comes up with a really strange looking font (from the output resulting from setting FC_DEBUG=1, it looks like it may be a font called "Arioso"?). I'm aiming for helvetica, which should be the default font for Qt anyway. Is there a way to find the offending file causing the error messages? Some debug option, perhaps? I have googled, and seen others on with this error message (mostly on GTk applications), but no answers to what causes it. The debian fontconfig package has three config files /etc/fonts/fonts.conf /etc/fonts/local.conf /var/lib/fontconfig/local.conf They all start with <?xml version="1.0"?> I have tried changing that to <?xml version="1.0" encoding="utf-8"?> but it didn't make any difference. KDE applications work without a hitch. fc-list works without giving any error messages. fc-list helvetica gives me: Helvetica:style=Bold Italic Helvetica:style=Italic Helvetica:style=Bold Helvetica:style=Regular fc-cache -v as my own user gives the following output: fc-cache: "/usr/share/fonts": skipping, no write access fc-cache: "/usr/X11R6/lib/X11/fonts/Type1": skipping, no write access fc-cache: "/usr/local/share/fonts": skipping, no write access fc-cache: "/home/sb/.fonts": skipping, no such directory fc-cache: "/var/lib/defoma/fontconfig.d": skipping, no write access fc-cache: "/usr/X11R6/lib/X11/fonts": skipping, no write access fc-cache: succeeded fc-cache -v as root gives a lot more output. There is an environment variable LANG=C set, but no LC_* variables set. Thanx! - Steinar