I just received my new 3D set LG 55LW5600. I tried out the 3D movie trailers and found about 70% of those not working at all at least with my TV set.
Pirates, Gforce and a few more were working excellent, however most failed with 2 totally different pictures (obviously left and right) on the TV.
I am aware that you need sometimes change the settings for 3D from left/right to right/left and / or left / right to up down, however no setting worked for these movies
In my opionion these trailers do not show in 3D. Instead they show in 2D with a 3D signal being sent to the TV. Therefore the picture is cut in half by the TV and shown to the left / right eye.
Hopefully somebody here can check in this issue.