Keyboard controls work partially or do not work at all if JSlider.setSnapToTicks() was invoked and minor ticks value is different from "1".
For example, if major ticks value is 6 and minor ticks value is 2 the knob can be moved only to the right (but not to the left) using the keyboard. Setting minor ticks value to 3 makes knob moveable only by mouse drag (mouse clicks do not work either).
(reproduced with 1.4.2_04-b05, 1.5.0_06-b05, 1.6.0-rc-b96)

Please compile and run following code to reproduce the problem:

----------------- ATest.java ----------------------
import javax.swing.*;

public class ATest {

    public void sliderTest() {
        JFrame f = new JFrame();
        JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 50, 25);

        slider.setMinimum(0);

        slider.setValue(0);
        slider.setMaximum(30);
        slider.setPaintLabels(true);
        slider.setPaintTicks(true);

        slider.setMinorTickSpacing(2);
        slider.setMajorTickSpacing(6);

        slider.setSnapToTicks(true);

        JPanel panel = new JPanel();
        panel.add(slider);
panel.setVisible(true);

        f.getContentPane().add(panel);
f.pack();

        f.setVisible(true);


    }

    public ATest() {
    }

    public static void main(String argv[]) {
        ATest t = new ATest();
        t.sliderTest();
    }
}
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