M3U Playlists w/ special characters in path to audio track. In other words, a playlist with an entry that looks like this:
#EXTINF:1437733,Hélène Grimaud - Brahms: Piano Concerto #1 In D Minor, Op. 15 - 1. Maestoso
/Volumes/LaCie/My iTunes Music/iTunes Media/Music/Hélène Grimaud/Brahms_ Piano Concerto #1/01 Brahms_ Piano Concerto #1 In D Minor, Op. 15 - 1. Maestoso.aif
Note the bold emphasis I’ve added to the artist name part of the path (iTunes media library).
If the playlists is entirely made up of such tracks, the entire playlist does not display in Roon.
I mean… really? This drops a big chunk of my classical collection.