When selecting a column from the options of the down arrow menu at the bottom of the keyboard in the piano roll, if the user selects the left half of the column, it adjusts the correct columns. However, if the user selects the rightmost half of the column, then the adjustments take place in the column to the right of the one the user is trying to adjust.
Steps to reproduce:
1- Select New Midi Out Device, select Gervill
2- Select new Midi Lane
3- Select Piano Roll
4- Click the down arrow at the bottom of the keyboard.
5- Select any option, and adjuct any of the options by clicking with the mouse on the right half of the column.
Detailed Bug Report