Once again, now in Squeak 2.8, released in August, 2000 (2.0 was released in May, 1998). Now I know where the assortment of window border colours came from! This seems to be the last version to use the eponymous MVC-based user interface. I love left-hand scrollbars. Morphic is available as a preview. No unit testing classes.
Going back to Squeak 2.8… by default it displays in 8-bit colour, and results in every colour being translucent. You can make things out if you place it over a dark background. It also does this in 16-bit. It’s fine in 32-bit, except for text selections, the background of which become completely transparent.
@murtezayesil It’s a Wayland session but the same happens in an X.Org session, so I doubt it’s related to XWayland.