Hi dro,
Studio.xnf without the previous line breaks has been working normally. Thank you for responding to this thread and the text editor suggestion. I've been using notepad for my manual editing of studio.xnf, when needed. I can use another text editor to deal with the change of line breaks.
I removed the studio.xnf.backup file between WACUP sessions. It was recreated after the next session. As you know, studio.xnf is updated after a session if needed, like if the modern skin was changed during the session. Both studio.xnf and the backup file now appear to have no line breaks. Without the line breaks, it takes longer to find sections in the file when I need to edit stuff. I seldom need to edit stuff (since I seldom change the modern skins I'm using), so having to take more time was not a problem, more of a minor nuisance.
It is best not to manually edit the file anyway. I have learned over the years that if not very careful, it is easy to mess it up.