My Coworker's machines show this bug where the leaves have white pixels that do not get smaller at a distance. When you are up close, just a few pixels of white is not noticeable. At a distance it can cover the whole tree. My thought is this is a hardware issue- they are on older cards or integrated graphics. Anyone else…
Oh, I should have mentioned this earlier- The optimized material preview looks like junk on their computers. It is just a bunch of white noisey pixels.