I noticed that I began having trouble with saving figures that contain transparency.
First, the figure appears on the screen as desired. Then just as the figure is being saved, the filled color disappears, leaving just the lines. The image that is saved contains only lines, not the fill.
Eventually discovered that the source of the problem is setting the 'DefaultTextInterpreter' to 'latex'.
Is this a bug?
set(0, 'DefaultTextInterpreter', 'latex')
polyg = rand([2,20]);
h = fill(polyg(1,:), polyg(2,:), 'k');
set(h, 'facecolor', 'r', 'facealpha', 0.5);
Using Matlab 184.108.40.2063 (R2012b) on a Mac OS 10.8.5.