Yeah, I'm also having some trouble with the exact same model.

I've gotten the 3D to work off of one of the Samsung online apps (Internet@TV/Samsung Apps)... I was able to watch the Shrek trailer in FULL 3D. But when I try watching the demo video of Monsters vs Aliens that came with the Samsung 3D glasses pack, the 3D is always messed up no matter what settings I try (other than the artificial 2D-3D option).

Something's not working right.