why the ticks on axis dispear on one side?

Hi fellows,

I am trying to do some pretty plots. But some how the ticks on the axis showing on both sides

but anther one only showing on one side

Do you understand why? I am using very similar codes to plot these two imgages and for both of them have set

    % axis([-20,120,-20,120]);
     axis square;

Answer 1

[Walter Roberson]

This is an OpenGL related bug.

Give the command

opengl software

or resize the figure window to be slightly larger.