???? You do =not= have to disable the Open GL support of the card itself; all you should have to do is turn off the Open GL support in Vue, which should only affect the preview window, if I remember correctly. As far as what it does, OpenGL is an API library that allows you to access any extra features of your video card. Rather like the Direct 3D part of DirectX. But it is one of those nasty open format cross platform API's that MS has been trying to kill for years...as it's cross platform and non proprietary. Well crafted. Consistent. Sun created it back in the days when it was King of the workstation (any video function coded in OpenGl is supposed to work on Windows, Mac, Solaris, anything that claims OpenGl compliance. One of the big reasons you see ports of the Quake series of games onto other platforms; John Carmack swears by OpenGL, and at DirectX). In the case of Vue D'Esprit, (and I will be corrected if I am wrong :P ), the OpenGL support is used to accelerate the rendering of the Preview image, and maybe some frame refreshing of the main image. The currently in beta 4.12 patch -may- address this issue. It seems to be an issue -only- with the GF-3's and -4's. Which leads me to think it has to do with the commands for the pixel shaders and vertex shaders being bolted onto the GL standard.