Do you mean, as long as userlibrary has been moved away? Or have you resolved that problem now?
Sorry, I haven’t had time to look into this any further. The gif I posted earlier in the thread was what it looked like without a userlibrary.xml installed, so it definitely was working then. I’m not sure yet why it doesn’t work with my usual userlibrary.xml settings active.
Ok. take your time. I just would appreciate it if you could find some time some day but zero pressure 
.
Maybe a bit off-topic, but doricolibs come in 2 flavors: kScoreLibrary and kScoreOptions (and even a mixed flavor!). Can the kScoreOptions flavor be also stored in the DefaultLibraryAdditions folder?
Oops! This is from an Application log:
2024-10-18 13:48:21.472 [info] Initializing Resources
2024-10-18 13:48:21.473 [info] Initializing Default and User Score Library
2024-10-18 13:48:21.476 [info] Loading All Parts of Default Library
2024-10-18 13:48:24.409 [info] Loading All Parts of Default Library…done
2024-10-18 13:48:24.413 [info] Loading Extra Library: custom
2024-10-18 13:48:24.457 [info] Loading Extra Library…done
2024-10-18 13:48:24.487 [info] Loading User Library
2024-10-18 13:48:24.530 [info] Loading User Library…done
2024-10-18 13:48:24.532 [info] Loading Instrument Name Libraries
2024-10-18 13:48:25.317 [info] Loading Instrument Name Libraries…done
2024-10-18 13:48:25.319 [info] Initializing Playback Resource Files
Are we chasing the wrong horse? I know I am anyway because my understanding was that the Additional doricolibs would be loaded last of all. But clearly the userlibrary is loaded after them, so it might not be astonishing if the userlibrary would override the additional ones.
I just reinstalled my user library, but I modified the element in it to include the entityIds of the accidentals created in the extra doricolib. And they appeared when I edited the tonality system!
Sorry to have led you up (or down?) the garden path. I am afraid there is no problem here, except the fact thatI had false expectations about the loading order of libraries 
!
If you concur with my analysis I will set the topic to resolved.
And much better from my point of view, if I just remove the AccidentalSystem definition from the userlibrary, it works as well. That is way smarter than my first attempt. It means that the userlibrary should not be cluttered with redundant definitions, and extra doricolibs will stand a better chance of being effective.