First of all, this bug doesn’t seem to happen all the time, just in some situations. I am not sure exactly how to reproduce it. However, you can try the following steps:
OS: MacOS Sonoma
- Load up a complex project with at least 30 Instruments (KONTAKT, EW, BBC, heavy sample based project)
- Open Piano Roll and click on a note
- Move the note with your cursor keys while hovering your mouse over it
What I expect to happen:
Note is being transposed and the graphical representation of it on screen moves around in the Y-axis unaffected by the mouse cursor.
What instead happens:
Copies of the note get imprinted on the screen where the mouse cursor goes, creating a “stack” of copied “ghost” note shapes. However, the note is actually not being copied, it transposes perfectly fine, there is just no visual representation of where the note is supposed to be due to it being covered by these “ghost” notes.
Here is a video of the behavior in action: