xvfb - Python Module - simpe_3dviz - wxpython - gui

[Gribouillis]

It's only a conjecture but I find the way you start the Xvfb process a little strange. Why use shell=True? Why use stdout=PIPE? The problem with stdout=PIPE is that if the process attempts to print some output it will block because you didn't add code to read in the pipe.

I suggest that you try

xproc = subprocess.Popen(['sudo',  'Xvfb', ':1'])

You may also consider to terminate the subprocess at some point.