Today when I opened Emacs (26.3) for the first time since updating Linux (Arch) I was greeted with a wide (two spaces) cursor, and every letter on the screen separated by a space, like this:
F i l e l o c a t i o n s
This is true everywhere: in the text, in the mode line, in the linum numbers to the left on the window. The only place it isn't true is in a read-only buffer like the initial screen that comes up when you start Emacs. I don't see any errors in the *Messages* buffer.
I don't know where to start. Any ideas?