Hi Justin,
After several trials I think I get it.
As you can see at the beginning of the video, notes are correctly inserted at mouse cursor.
Second part of the video, problem happens when I open a midi window on the bottom tab : notes are inserted above the clicked row.
End of the video, editing is OK after I have closed the tab window.
https://drive.google.com/open?id=0B-...0lBYVhydThBV1k