I noticed the one reporting the bug has a nvidia, so it looks like it has nothing to do with your card.
Just to test, try this :
Download the attached file testconfig.zip , in it there’s “startup.blend” and “userpref.blend”
Put both blend files in your
(of course delete anything that could be here first)
The difference with the default factory is that i have gone in File -> User Preferences -> System and disabled “GPU Mipmap Generation”, turned OFF the Anisotropic Filtering and disabled “Text Antialiasing” , then just for testing in the i removed the shading from the buttons in User Preferences -> Themes -> 3DView.
Those settings turned off may improve a little bit performance, but more importantly, they should then be easier on your G31/G33 , so if the problem is with the G31/G33 , maybe this will help.
testconfig.zip (107 KB)