So I've been having a number of graphic problems with my 2012 MBP (Non-retnia)
First is screen distortion. I have black rectangles flash black and a pixelated yellow. Moving a window or program over the area solves this. This has been on going for a year, with flare ups. I've been to the apple store, they've replaced the logic board, full re-install, and I've upgraded the ram to 16GB. Still happening. I talked to them today and they won't look at it until I get a new hard drive (It's currently failing) and "My MBP doesn't officially support more than 8GB of ram"
I also have 2 window server crashes. Logs posted below. I have another appointment on Monday when I put original hard drive and RAM back in. I would love some more insight into this.
Logs are too long for here, can be found at https://drive.google.com/file/d/0B2LwrG50dUFDT2JZcndRY1V2cVE/view?usp=sharing