Hi @FWSchreck, just to chime in here – there’s a known issue where chords that are not exactly 1 bar in length can’t be replaced directly on the main track, unless the replacement is dragged from the main track itself.
This will be fixed in a future update. In the meantime, a temporary workaround is to first drag the chord to an empty space on the main track, then replace or swap from there.
Hope that helps. Cheers.