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Try

    plt.savefig('test2.png')

instead. That seems to solve the problem for me. SAGE_TMP is really only for use in testing, and has nothing to do with any notebook cells. That it worked before is really a bug, I would think...

Try

    plt.savefig('test2.png')

instead. That seems to solve the problem for me. me; at least, a link appears for the figure. SAGE_TMP is really only for use in testing, and has nothing to do with any notebook cells. That it worked before is really a bug, I would think...