flickering cubes

I have flickering cubes in my graph editor.  Not quite sure why.  I thought it might be double buffering, but now I'm thinking it may be more application related.  It seems to be related to the mouse or keyboard (multithreading?)  I have gone through various help with flickering, and have been unable to fix the problem.  I am on a Mac Mini with Mac OSX Mountain Lion with an  Intel HD Graphics 4000.  I have attached a tar gzipped file.  Thanks for any help you can give.impact3d.gz

Hi

Do you reproduce your flickering problem with a more rudimentary example like this one?
https://gist.github.com/gouessej/3420e2b6f632efdddf98