png backend seems broken?
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Description
I'm using this minimalist examples for the 4.5 Jupyter notebook interface:

The same happens actually if I use the `x3d` interface but then try to use `mlab.savefig` to save the figure as a `png`. The resulting png is just black.
System: macOS 10.12.3, Python 2.7 using conda env, all latest updates, mayavi 4.5 from conda.
Note to @portyankina
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