Wow. What a thread. It was quite overwhelming to read the entire thread, so I might have missed some points..
Main problem for me is that I was rejected to repair my Mid-2012 Retina Macbook Pro. After Genius Bar's testings, my Macbook seem to have passed their test. I tried to replicate problem, but it didn't happen. A week later, which is today, I got the glitch again. My Macbook even froze all at a sudden two times this week. Strange thing is that those two freezes happened at around same time (8:30AM). I acquired some screenshots and picture of my screen with the problem this time. So I'm going to try visiting Genius bar once again.
Has anyone got to get their Macbook fixed at the second trial like me? Did you have to pay additional cost or shipping fee?
My Macbook had received Samsung LCD replacement and Macbook itself is custom ordered one that have these options: 2.7 Ghz i7 CPU, 16GB Ram, 256GB SSD.
I was wondering if my macbook have different cooling component or something since it have 2.7 Ghz CPU and this is why I get the glitch less occasionally. If anyone have 2.7 Ghz CPU option in their Macbook and have this issue, I'd like to know.
My Macbook's symptom:
I get graphical glitch (lines and boxes, though not entire screen and happens more often on Safari and some times in Photoshop). However, this doesn't happen routinely and its very difficult to reproduce. I can use as it is, as mine doesn't glitch and turn itself off often, but I had to re-do some important work due to occasional system crash.
Thanks!