[Gmsh] no picture seen in gmsh

[David Underwood]

I installed gmsh 2.8.5 on an almost  new macbook pro (not reticle).
There is no picture shown when I load tutorials.
I got this same behavior with Yosemite and also previous OS.
I checked that openGL functions for other applications.
X11 is installed.
Once, after playing with many options for a while, the picture for tutorial 1 showed up, but it disappeared when I went to full screen.

Any suggestions?