Here's another way that "articulate.ly" messes with bar line checks. If you put a \repeat volta in the middle of a measure, you cannot get reliable bar line checks (|) after that. Here's my MWE:
%%%Start \version "2.20.0" rightHand = \relative c' { \repeat volta 2 { \partial 4 f4 c4 d e f | c4 d e } \repeat volta 2 { f4 | c4 d e f | } } \include "articulate.ly" \score { \articulate { % Remove articulate and all is well! \new Staff \rightHand } } %%%End --- Knute Snortum (via Gmail)