I think problems with one eye that aren't quite mirrored by the other might be a reason. Magic Eye doesn't work for me either. My problem is that one eye's long-sighted, the other short-sighted and while both are open at once, I tend to use whichever is most suited for whatever I'm looking at and don't see through the other. Hence no 3D. Wish it worked, it'd be cool to have a prog in 3D.