Hello, After updating graph_tool from version 2.33 to 2.35, I cannot make plots with graphviz_draw() anymore. Here is a minimal example to reproduce the error: ################################# import graph_tool.all as gt g = gt.Graph() v0 = g.add_vertex() v1 = g.add_vertex() e01 = g.add_edge(v0,v1) g_dict = {'layout':'neato'} gt.graphviz_draw(g, gprops=g_dict) ################################# The error message is: ################################# Error: Layout type: "n" not recognized. Use one of: circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi Error: Layout was not done Segmentation fault ################################# I suspect that somewhere the string 'neato' is converted to a single character 'n'. In my real code, I also get several warning messages quoting only the first character of miscellaneous strings. I have python3-graph-tool installed on my computer which runs on Linux Mint 19.2 Tina (based on Ubuntu 18.04 LTS, bionic). My graphviz version is 2.40.1. Can anyone reproduce this? Best regards Rolf -- ----------------------------------------------------------------------- Rolf Sander phone: [+49] 6131/305-4610 Max-Planck Institute of Chemistry email: rolf.sander@mpic.de PO Box 3060, 55020 Mainz, Germany homepage: www.rolf-sander.net ----------------------------------------------------------------------- https://www.encyclopedia-of-geosciences.net https://www.geoscientific-model-development.net -----------------------------------------------------------------------