Totally same here. The glxgears and other 3D apps. (ex. games) run fine, 
because I use 'Sync to VBlank' for OpenGL applications (set it in 
nvidia-settings), bus without this, glxgears runs fuzzy. Vpython throws a 'seg. 
fault' on Ubuntu 11.04, when the vpython scene window appears (try this in 
python: from visual import * ; scene.visible=True ---> seg fault).
I use the last vpython (5.71, compilled from source, but the last .deb version 
from the repos. works same), on ubuntu 11.04 x64, with nvidia-current video 
driver (Geforce7000M, driver version: 280.13-0ubuntu1~natty~xup1).

When I removed the closed source nvidia driver and reinstalled mesa-
tools/mesa-tools-extra, vpython 5.71 runs well (!), however runs very
slowly. After that I reenabled nvidia-current (and xorg.conf), and I see
the same seg. fault error.

The situation is funny, because vpython runs in windows under VirtualBox
(in same ubuntu system), and it was runing a month ago with nvidia-
current driver.

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https://bugs.launchpad.net/bugs/787932

Title:
  Segmentation Fault in python program using visual-python module after
  update to Natty Narwhal

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