Cannot run gnome-split after initial install and updating

[John Obliskey]

after initially installing Ubuntu Mate 16.04 64 bit on my Lenovo T430 laptop I tried to install gnome-split. It seemed to install correctly but upon launching the program i got the below message box:

john@john-ThinkPad-T430:~$ sudo gnome-split
[sudo] password for john:
DANGER: Gtk-WARNING, Theme parsing error: gtk-main.css:69:33: Failed to
import: Error opening file: No such file or directory
DANGER: Gtk-CRITICAL, gtk_main_quit: assertion 'main_loops != NULL' failed
DANGER: Gtk-CRITICAL, gtk_main_quit: assertion 'main_loops != NULL' failed
DANGER: Gtk-CRITICAL, gtk_main_quit: assertion 'main_loops != NULL' failed
DANGER: Gtk-CRITICAL, gtk_main_quit: assertion 'main_loops != NULL' failed

I decided to try one thing after being told on the forums that this program installed and ran perfectly on multiple computers. Since the message box seemed to point out that it was a "THEME" that might be at fault i decided to try switching to a different theme. It now works perfectly.

 The default theme used at initial install seems to be the problem. It might also be caused by a conflict with Nvidia display driver that i have installed .. ALTHOUGH all other themes installed by default work fine.

Thanks

john obliskey