I am running FreeBSD 10.2 64 bit with fvwm-crystal. In all other cases, just starting a program from an xterm opens a window with buttons. Blender does not open in a window with buttons, which in itself is not a problem. However, when I try to set user preferences, the new window does not have buttons, and I can not close the User Preferences window. I tried "dbus-launch blender" but no difference. I do not see any configuration options for recompiling blender that might make any difference. Any advice would be appreciated. Thanks.