Playing around with this, I found that the order of the graphic objects in the sum matters: graph_v + graph_spher generates the error, while graph_spher + graph_v works fine. Besides, the tachyon viewer works fine in both cases. Only the default 3D viewer (jsmol) yields the error for graph_v + graph_spher. I've updated the worksheet at http://nbviewer.jupyter.org/github/egourgoulhon/SageMathTest/blob/master/Worksheets/test_sphere.ipynb to exhibit this (notice that nbviewer.jupyter.org does not display the jsmol, hence the blank spaces).
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