The image distorts in the editor, it does distort too in chrome, but it doesn't when I preview in FF 14.0.1
Apart from this fx though, the others I've been trying are working.
Edit: I've just tested a combination Glass+GrayScale, and it happens to be flipping the over cog and under texture in the "WebGL shader effects.capx". Not really something I would have expected.
But it does in FF and chrome (in the editor, it only flips the under texture).