I applied the FC3 updates on 12/3, this include xorg and gtk updates. Now my gtk application dumps core displaying on the FC3 Xserver. I traced the problem to: if( (W.big_font = gdk_font_load ( big_font_name )) == NULL ) { printf("Error unable to font: %s\n", big_font_name); exit(0); } W.big_font_wid = gdk_char_width( W.big_font, 'W' ); W.big_font_hgt = W.big_font->ascent+W.big_font->descent; printf("big_font: name=%s %dx%d\n", big_font_name, W.big_font_wid, W.big_font_hgt ); printf("%d \n", gdk_char_width( W.big_font, 'W' )); Here is the output: big_font: name=-*-lucidatypewriter-*-*-*-*-18-*-*-*-*-*-*-* 0x19 0 Floating exception (core dumped) Something is broken with FC3 with get_char_wid() -> return 0 for wid for this font. Note, this works if I used a difference font (ie Fonts are -*-fixed-*-*-*-*-20-*-*-*-*-*-*-*) Also the application runs OK if I export my DISPLAY to my office computer (XP running X-Win32 server with Solaris Openlook window manager). Only noticed the problem when running on the FC3 console. Tony /-----------------------------------------------------------------------\ | Tony Denault | Email: denault@xxxxxxxxxxxxxxxxxxx | | Institute for Astronomy | Phone: (808) 932-2378 | | 640 North Aohoku Place | Fax: (808) 933-0737 | | Hilo, Hawaii 96720 | | \-----------------------------------------------------------------------/