And the beta testing continues for a buggy computer. I encountered a weird problem an hour ago while I was surfing the web on safari on my new iMac 5k. I noticed some kind of glitch/artifacts vertical bar (1/2 inch wide) from top to bottom in the middle of the screen. once i hovered the mouse across it it disappeared. I did not get the chance to capture a screen shot. what is that exactly??? I've been trying to heavly load the computer with work, Opening multiple windows, playing 4k videos, edit on lightroom and iMovies but didn't happen again! Is this kind of faulty hardware or a software glitch? I switched to Apple cause I thought I am paying for peace of mind. i am kinda nervous now.