How do I close the User Preferences window when it is not opened by the window manager? 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.
You can open the preferences inside the existing blender window by setting the editor type in the header of any existing area:



As for why blender isn't getting a titlebar from the wm, I have no idea. It works fine for me here on openbox.