Apparently up and down arrows map to opacity, as do right and left arrows. Shouldn't they map to scroll up and down?
This only happens when you’ve clicked on the opacity slider (you can see a halo around it because it’s selected). I am working on making the slider non-selectable to keep this from happening, but for now, if you click elsewhere (on the shortcuts panel, for example) to deselect the slider, the keys should scroll up and down again.
Thanks, that works!