Here are some things I probably missed:

1., For me it works only when I have both OpenGL libraries in Google directory:

• first is "opengl32.orig.dll", this is renamed original file from Windows/system32 directory,
• second is OpenGL32.dll (888 KB) - that is file copied from GLIntercept directory. If theres one of them missing, Google does nothing.

2., Also note that sometimes you need press ctrl+shift+a several times, because it doesnt react always.

3., Make sure that your Google installation runs in OpenGL mode and not in DirectX ;)

If this doesnt help, then I really dont know. Only watch official forum.