plotting_many_lines.py fails in WinPython 3.x

The example [plotting_many_lines.py](https://github.com/enthought/mayavi/blob/master/docs/source/mayavi/auto/plotting_many_lines.py) (explained [here](http://docs.enthought.com/mayavi/mayavi/auto/example_plotting_many_lines.html)) works without any problem in WinPython 2.7.X (with the necessary additional wheels acquired from [Gohlke's page](http://www.lfd.uci.edu/~gohlke/pythonlibs/) for Mayavi 4.5.0).

When trying to run `plotting_many_lines.py` in WinPython 3.X (I have tried in 3.4.4.3 and 3.6.0.1), it fails: the mayavi scene window remains empty, and the vtkOutputWindow displays a bunch of warnings:


I have tried some other examples, which work without problems in all WinPython versions. Can someone confirm if this is also an issue in other python distros?