This bug might be related to https://bugs.launchpad.net/ubuntu/+source/light-themes/+bug/1090896
In summary, light-themes does not properly follow the gtk3 theme spec and so the current focused window looks identical to all the others.
This bug might be related to https:/ /bugs.launchpad .net/ubuntu/ +source/ light-themes/ +bug/1090896
In summary, light-themes does not properly follow the gtk3 theme spec and so the current focused window looks identical to all the others.