[graph-tool] Segmentation fault when running the animation scripts in the Cookbook section

Dear all, I am new to graph tool. I have installed it under Ubuntu 14.04 64-bit and Python 2.7. When I tried to run the animation demos in the Cookbook section of the documentation I got a segmentation fault error. I loaded the core with gdb but couldnt get any further details on the source of the error. Stepping into the code I managed to find out that the segmentation fault takes place when win.graph.regenerate_surface() is executed, e.g. On line 122 in animation_sirs.py. Gtk seems to be using TkAgg for what it matters. Do you have any idea on why this error occurs? Shall I try another GTK backend? Kind regards Yannis