50'?!! That's ****ing huge are you sure it's not 50"?
LOL. Nice catch there Shleby!! Imagine that! You would have to walk back and forth to play the game!

It could be you getting use to the 120ghz refresh rate. I have the 46" Samsung 7 series. When I started to play for the first time it felt very strange. Like my eyes needed some getting use to. I did change the setting to "low" on the refresh rate. It helped. See if that will work for you.