I'm using Debian testing (stretch) with i3 running urxvt with Source Code Pro (a TTF font).
MOC (an ncurses program) as it appeared last week:
And now - notice the vertical lines:
I can "solve" the issue by reducing urxvt's lineSpace to 0, but I want that line spacing - and it worked before.
Any ideas what could cause this? urxvt bug? x11 font rendering bug?