Hi, seems there's a problem when LC_NUMERIC is set to a locale which uses ',' as '.' (reproduced with de_DE and cs_CZ.utf8). This patch (hack?) seems to fix it (at last for me. Radek?): --- t3main.cpp.orig 2004-02-06 23:53:20.000000000 +0100 +++ t3main.cpp 2004-02-06 23:46:24.000000000 +0100 @@ -694,6 +694,8 @@ int main(int argc, char ** argv) { + (void) gtk_set_locale(); + (void) setlocale(LC_NUMERIC, "C"); //char **args; poptContext options_context; const struct poptOption options_table[] = { Feel free to tune it to your taste :) Thanks to Radek for reporting it and pointing out the fix verbatim. Michael