Hi Knute!
(define-public (output-framework basename book scopes fields) (let* ((port (%make-void-port "w")) (outputter (ly:make-paper-outputter port stencil-dispatch-alist))KnutWith the above change, Windows LilyPond works fine. I don't have any complex source files to try, but I did try it on a Satie piece that's -- at least -- unusual.
Thanks for testing and the bug report. I uploaded a corrected installer. Which version of Windows do you use? Knut