Dear Sir or Madam, My name is Jun Liao. I have installed ccp4 6.4.0 (CCP4 Program Suite 6.4.0 CCP4Interface 2.2.1) recently using ccp4sm on CentOS6.6 (Kernel Linux 2.6.32-431.el6.x86_64, GNOME 2.28.2). When I tried to load Coot, it always show the following error message. How can I fix the problem? Thank you for your attention and great help, Best, Jun Liao The following is the message I copied from the failure of Coot. [root@liaojun ~]# coot --version-full COOT_PREFIX is /progs/ccp4/ccp4-6.4.0 /progs/ccp4/ccp4-6.4.0/bin/coot-real --version-full 0.7.2 (revision 4730) [with guile 1.8.8 embedded] [with python 2.7.5 embedded] Binary type: Linux-x86_64-centos-5-python-gtk2 [root@liaojun ~]# coot COOT_PREFIX is /progs/ccp4/ccp4-6.4.0 /progs/ccp4/ccp4-6.4.0/bin/coot-real Acquiring application resources from /progs/ccp4/ccp4-6.4.0/share/coot/cootrc Gtk-Message: Failed to load module "canberra-gtk-module" Gtk-Message: Failed to load module "pk-gtk-module" Xlib: extension "GLX" missing on display ":0.0". freeglut (/progs/ccp4/ccp4-6.4.0/bin/coot-real): OpenGL GLX extension not supported by display ':0.0' Gtk-Message: Failed to load module "canberra-gtk-module" Gtk-Message: Failed to load module "pk-gtk-module" coot-exe: "/progs/ccp4/ccp4-6.4.0/bin/coot-real" coot-version: /progs/ccp4/ccp4-6.4.0/bin/coot-real platform: /bin/uname core: #f No core file found. No debugging This is not helpful. Please turn on core dumps before sending a crash report School of Life Science and Technology, RM 311B ShanghaiTech University 100 Haike Rd, Zhangjiang Hi-Tech Park Pudong District, Shanghai, P. R. China 201210 Tel: 86-21-20685023 (Office) Tel: 86-21-20685048 (Lab)