JCK            : JCK6.0 b29
J2SE           : FAIL - mustang b97
Platform[s]    : FAIL - windows
switch/Mode    : FAIL - default

It seems that consequent calls of setScrollPosition stops working properly after some time. Two JCK tests fail because of this: 

api/java_awt/ScrollPane/descriptions.html#sets[ScrollPane0408_15]
api/java_awt/ScrollPane/descriptions.html#sets[ScrollPane0415_15]

Steps to reproduce:

run the following code on windows.

import java.awt.*;
import java.io.PrintWriter;
import java.util.Properties;
import java.util.Vector;

public class ScrollPaneTest{

public static void main(String[] args){
        Point p;
        Frame frame = new Frame();
        frame.setBounds(100, 100, 100, 100);
        ScrollPane sp = new ScrollPane(ScrollPane.SCROLLBARS_NEVER); // Create new ScrollPane
        Canvas canvas = new Canvas(); // Create new Canvas
        canvas.setSize(200, 200);
        sp.add(canvas);
        frame.add("Center", sp);
        frame.setVisible(true);

        for (int i = 0; i < 10; i++) {
            try 
	    {
		        p = new Point(55, 55);
	                sp.setScrollPosition(p.x, p.y);
                	waitForScrollPosition(sp, p);

		        p = new Point(56, 56);
	                sp.setScrollPosition(p.x, p.y);
                	waitForScrollPosition(sp, p);

            } 
	    catch (InterruptedException e) 
	    {
                	frame.dispose();
                	System.out.println( "couldn't wait till the right scroll position" );
			return;
            }
        }
        frame.dispose();
        System.out.println("OKAY");
 }


    public static void waitForScrollPosition(ScrollPane sp,Point p)
        throws InterruptedException {

        String lock = "the lock";
        synchronized (lock) {
	    System.out.println("ScrollPositio is: "+sp.getScrollPosition()+" should be "+p);
            for (int i=0; !p.equals(sp.getScrollPosition()) && (i < 10); i++) {
			System.out.println("ScrollPosition is: "+sp.getScrollPosition()+" should be "+p);
                lock.wait(1000);
            }
            if ( !p.equals(sp.getScrollPosition()) ) {
                System.out.println("set position: "+p);
                System.out.println("get position: "+sp.getScrollPosition());
                throw new InterruptedException("Bad scroll position for pretty long time");
            }
        }
    }




}


You'll see that despite this code just moves scroll position from 55,55 to 56,56 and backwards it works for the first time but after some attempts goes to 0,56.