I installed 2018.48 in a x75d 2.5hw today. I was previously on 44. I got a chance to drive around tonight on rural and main roads. Unfortunately, autopilot has a wierd new behavior. Not only does it hug the left and/or center line more than in previous versions, but it consistently crosses over the lane line on inside of the curve. So if the curve turns right, the X crosses OVER the right lane line for the entirety. If the curve turns left, the X crosses over the left lane line. At first I thought it must be a fluke, or just recalibrating for the new update. Unfortunately, no, it's just poor driving through curves. For the record, I love autopilot and use it all the time. In 48, something definitely changed for the worse.