The new progress bar color is distracting in night mode. It also made your progress opaque while disabling the ability to quickly tap portions of a lesson for a quick refresher. Now you MUST inefficiently swipe through the entire lesson from start to finish, which breaks the previously decent UX. Anyone actually paying attention (which apparently nobody was) could've realized how much worse this change was. There's not even a setting to turn the "puke line" off. Truly an example of bad coding.