Personally, I had a PG278Q dated July 2014 with vertical lines esp in 3D or games. I sent it to RMA. Now I have a new PG278Q dated October 2014: perfect, no vertical stripe.Cables and drivers are not the cause of this defect.
I also have a PG278Q and I have also the problem of vertical lines. For your information, I have tried to change the standard cable to a high-end http://www.delock.com/produkte/G_82772/merkmale.html?setLanguage=en (Displayport 1.2 , Twisted-pair ca...