Arc-Menu Layout change.
The menu location changed slightly. I have my Doc on the left side of the screen, and Arc-Menu Icon at the top, when I click on the Icon, I get the menu.. with a < arrow and the top of the menu is almost all the way to the top. With v48, the menu now appears below the arc-menu icon with a arrow pointing up and to the left. It's subtle, but, Much prefer the old display.