MATLAB: Plot produces blank figure.

MATLABplot

Taking a course and running through a very simple example, but my Figure opens with just a blank black image. The data looks like it is loaded properly into X and y. Any guidance would be great.
clear ; close all; clc
fprintf('Plotting Data ...\n')
data = load('ex1data1.txt');
X = data(:, 1);  y = data(:, 2);  m = length(y);
% Plot Data
plotData(X, y);
fprintf('Program paused. Press enter to continue.\n');
pause;  
% Function %
function plotData(x, y)
figure; 
plot(x, y, 'rx', 'MarkerSize', 10);
ylabel('Profit in $10,000s');
xlabel('Population of City in 10,000s');
end

Best Answer

I tracked this down to being a video card issue. Was led to this conclusion through http://www.mathworks.com/help/matlab/ref/opengl.html. When I changed from opengl hardware to opengl software, the plot worked properly.
Even though my Matrox M-9148 card only supports OpenGL 2.0 (not 2.1), once I update the drivers, the hardware works without having to rely on using software.
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