AO problems

Hi,
I’ve got a problem with Screen Space Ambient Occlusion.
I’ve put together a GLSL shader based on some tutorials found on the net and on my own PC (with an AMD card) it works kind of ok, but on other peoples hardware it’s a total mess :cry:

I’ve put together a small demo for anyone to download:
drive.google.com/file/d/0B81FE0 … sp=sharing

If anyone is able to get some settings that look a bit like the screen on a nvidia gpu please let me know.
If anyone is able to find some errors in the buffer/texture/camera setup please let me know.
If anyone is able to find some errors in the shaders (or has better/faster/working shaders to share) please let me know.