When I'm manually editing notes (events) in the MIDI event window (piano roll), left clicking a note to move it will often delete it. My workflow ends up being:
1) Attempt to select a note by left clicking and immediately moving it
2) It deletes the note
3) Control-Z to add the note back
4) Attempt to select the note again .. rinse and repeat until I'm able to select and move without deleting it
Since I believe double-click is what deletes a note, I suspect what is happening is that the action of selecting a note and then immediately moving it is interpreted as a double-click. If I don't attempt to move it immediately (i.e. just select the note), it never accidentally deletes it. It's only when I attempt to left-click select and move in one action. It also doesn't matter if it's a single note or a selection of notes. The first note that's left-click selected during the move is deleted.
Can the double-click note behavior be turned off?
This is Windows 10, with Studio One Professional 220.127.116.11605.