I have created 3D surface plots using matplotlib as described . Everything works except when I set the axis limits. Then the plots look very strange. It appears that commands such as Axes.set_xlim() ...

This is not a lien on the 4.11 release. With the CIAO 4.11 code base (so close to master) and matplotlib version 2.2.3, I see the following behavior, where some, but not all calls to plot ...