OK, managed to reproduce the behavior in a a very simple project.
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Created an empty project, one song, one part, added a layer with default instrument Halion Sonic (added manually as I have “no default layer set” in preferences)
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Created a new song, copied the single layer from song 1 part 1 and pasted it “shared” into song 2 part 1
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I can now change the settings for the layer (Mute, Volume) in the layer controls for both songs independently
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However, if I when I go to the mixer tab, things are different - I can still change the mixer volumes for the layer independently for the layer in both songs. But when I change the “Mute” state in the mixer, it now changes for the mixer in both songs
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Could be coincidence, but now the layers in both songs now have the “blank” insert/send slots described by me in Issue - Insert FX lost and Bug with Inserts/Sends section
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When I save and reload the project, the insert/send slots reappear, but the shared “Mute” behavior is as before
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When I now try to add an insert FX to one of the shared layers in the mixer, the same FX appears in the other shared layer’s mixer channel, too - is this expected? I would have thought the sharing of the layer would be for the VST instrument to save on resources, but that I could use the shared layer copies with different inserts FX in the mixer for different songs.
The “Shared MIDI/Audio Controls global” settings are “Off” in the preferences.