/usr/share/themes/NOX/gtk-2.0/gtkrc:233 Murrine configuration option 'gradients' is no longer supported and will be ignored
x11-themes/murrine-themes - 0.98.0 version
x11-themes/gtk-engines-murrine - 0.98.0 version
Please report this with upstream. I don't use GNOME 2 anymore and hence can't reproduce this.
Seems easy to patch:
Apparently, there are 4 offending options: the unsupported "scrollbar_color" and "gradients" (only for gtk+-2?) and the deprecated "hilight_ratio" and "highlight_ratio", for which "highlight_shade" needs to be used instead. Apparently, "lightborder_ratio" can be changed to "lightborder_shade", too.
gtk+-2.24.4 (introspection, xinerama)
Fixed in 0.98.11.