I have been writing an example app demonstrating opengl python and gtk, however i have hit a weird issue you can see in the video below.

This only happens on one device i have tested another displays perfectly, basically i am getting bleed through when rotating the objects and i am at a loss as to why.

Any one able to help or suggest what might be causing this issue ?

http://youtu.be/74zD9wIodvQ

http://bazaar.launchpad.net/~oly/python-examples/trunk/view/head:/python-examples/gtk3/tut15/sample.py