Our old Samsung 22" monitor died and I finally got tired of waiting for an update so I purchased a new TBD over the weekend for my wife and I to use with our cMBP and rMBP. The single cable dock is great and is the reason I chose it over the Dell. Been using it for two days and I just noticed this defect in the screen. It's not a dead pixel and looks like something underneath the glass panel. It definitely wasn't there yesterday. Any ideas what this is or what happened? Tried to get a decent close up using my iPhone. I know I can return it for a replacement but doing so is such a pain.