The following simple code
*****************
subplot(111);clg;
%
x=linspace(0,3*pi,301);
subplot(211);
xlabel("x \n");
ylabel("sin(x)\n");
axis([0 2*pi -1.1 1.1]);
plot(x,sin(x));
%
subplot(212);
xlabel("x \n");
ylabel("cos(x)\n");
axis([0 2*pi -1.1 1.1]);
plot(x,cos(x));
**********************
give the graph on octave 2.1.50 (cygwin)
http://www.geocities.jp/tmacchant/Files/sbptest1.png
but the same code on octave 2.9.12 on MCVC
give the graph
http://www.geocities.jp/tmacchant/Files/sbptest2.png
The label and axis setting is ignored.