Bug 1a. With the edit window open and the arrange and edit timelines synchronized; if you change the instrument in the drop down box above where the audition notes check box is, the edit time line gets stuck until you click the arrange timeline.
Bug 1b. I changed the vertical zoom of the piano roll by Ctrl+MouseWheel and then changed the instrument in the drop down box mentioned above and the vertical zoom changed back to what it was before. After playing round with it (including changing the zoom with the zoom slider) I can't get the behaviour to repeat.
Bug 2. When I first open the edit window, the track list button is selected but the track listing isn't showing (the list was showing when I closed SO), so I have to click the button twice to show the list.
These are relatively minor issues but I thought I would just document them.