Just got this tv, set it up with hdmi to my cable box.
I can view youtube 3D fine. I don't have any 3D channels on cable lineup, but using the same hdmi cable and plugging into my laptop, I can play ripped 3D content in SBS mode, but hitting the 3D button does nothing. Going into the tv menu, 3D is greyed out.
Now, I know this works, because most people watch 3D movies this way. I called Vizio, and their tech support said I needed a 3D hdmi cable.
Despite explaining to them that I have the option when plugged into my cable box with the same HDMI cable.
So...what am I doing wrong?