Adobe's software quality is absolutely terrible these days. They seem to be using their new subscription model as permission to push out half-baked and buggy software updates, because they can more readily "fix" them later.
Adobe Illustrator CC has well-documented issues with GPU previews on machines with Intel integrated graphics. I personally contacted Adobe about this, and they blamed Apple, but I have seen exactly the same rendering issues on Windows laptops running Intel video chipsets.
Get it right, Adobe. We're professionals, not hobbyists.