The patch changed some settings. Basically, it swapped the resolution to match the desktop setting, which for most retina macs is not the full resolution. If you change the in-game resolution back to the full resolution of you monitor, your UI should be back to being nice and crisp. You will probably have to adjust the render scale (which affects the world, not the UI) down to keep your frame rates okay. As an example, on a late 2014 5k imac I set my resolution to 5120x2880 and my render scale to 50%.
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