Hi again, D'oh… The better implication for me to have gotten from your helpful email would have been to search for "list-head" in all the files in my path/folder…
Here's the output of that effort: [from OLL] edition-engraver/engine.scm:623: ) (wildcard2regex (list-tail (list-head mod-cl (1- (length mod-cl))) 1) )) oll-core/internal/os-path.scm:174: (list-head path-list (- (length path-list) 1)))) oll-core/internal/os-path.scm:208: (list-head file (- (length file) 1)))) oll-core/internal/os-path.scm:213: (list-head file (- (length file) 2)))) oll-core/internal/properties.scm:424: ((propset-path (list-head configuration-path (- (length configuration-path) 1))) oll-core/package.ily:59: (oll-root (list-head path (- (length path) 2))) oll-misc/custom-elements/compound-slurs/module.ily:261: (list-head (list-tail cps 1) (- (length cps) 2)) snippets/ly/_internal/options.ily:66: (parent (list-head opt-path (- (length opt-path) 1))) snippets/notation-snippets/compound-slurs/module.ily:261: (list-head (list-tail cps 1) (- (length cps) 2)) snippets/templates/adjustable-centered-stanzas/module.ily:45: (helper (cons (list-head remain next-sublist-size) accum) [from personal/non-OLL files] text-spanner-inner-texts.ly:160: (cons (list-head text-list (car line-count-list)) result))))) text-spanner-inner-texts.ly:198: (tslc (append (list-head tslc (1- (length tslc))) text-spanner-inner-texts.ly:463: (inner-texts (cdr (list-head texts (1- (length texts)))))) Anything there helpful for the purposes of diagnosis? Thanks, Kieren.