I have a Panasonic TH-P50UT30A 3D T/V all my 3D disc's play ok, all are in letterbox. I am using Cyberlink Power DVD 10 set on automatic detect 3D. I have downloaded a few 3D movies in SBS 1080 and most play when power DVD it detects 3D and tells me to switch to 3D mode, however a couple of my downloads do not play in letter box they play in full screen mode and power DVD 10 does not pick up that they are 3D. They play in full screen SBS. I have looked at the downloads that work ok to see if there is any difference in files I can't find anything in the one's that will not play to indicate to me that they are in full screen only. I have tried every setting in Power DVD to change from full screen to letterbox. One particular movie I have downloaded from 4 locations and still the same full screen. My question is, it seems full screen is the problem and if so is there a way I can fix it.