I had this issue:
~$ gnome-control-center
(gnome-control-center:3317): Gdk-WARNING **: 08:37:28.693: Cannot transform xsetting gtk-xft-dpi of type gchararray to type gint
(gnome-control-center:3317): Gdk-WARNING **: 08:37:28.701: Cannot transform xsetting gtk-xft-dpi of type gchararray to type gint
(gnome-control-center:3317): Gdk-WARNING **: 08:37:29.409: Cannot transform xsetting gtk-xft-dpi of type gchararray to type gint
(gnome-control-center:3317): Gdk-WARNING **: 08:37:29.409: Cannot transform xsetting gtk-enable-input-feedback-sounds of type gchararray to type gboolean
(gnome-control-center:3317): Gdk-WARNING **: 08:37:29.409: Cannot transform xsetting gtk-enable-event-sounds of type gchararray to type gboolean
Segmentation fault (core dumped)
After some googling, I found a suggestion at https://bbs.archlinux.org/viewtopic.php?id=244792
I executed the command:
dconf reset -f /org/gnome/control-center/
And the gnome-control-center was able to open again