I have been testing some things trying to get the culprit package but I didn't find anything.
The problem persists creating a new user and logging in with the new user. I also tried different fonts in Konsole and some of them are less affected than others but all of them have colored borders, making the terminal a text rainbow. I have seen some recent font related bugs in KDE's bugtracker but none of them seem to match my problem. Nobody else noticed this problem? Is it possible I have a missing package somewhere? I have installed task-kde-desktop but I'm not sure this guarantees all needed packages are installed. Thanks in advance