FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
If AutoResize is set  to off for the JTable and you try to reorder the columns using Drag & Drop while the horizontal scroll bar is moved to the right a bit... The horizontal scroll bar will auto-scroll back to the left most position, making it impossible to order the columns how you want.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached source code... scroll to the right a little... and try to reorder the columns.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The scroll bar would stay stationary as I reorder the columns... as it did in previous versions of Java
ACTUAL -
The scroll bar auto-scrolled back to the left

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.qw.utilities;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class ColumnReorder {
	 private static  void doTableTest() {
    	DefaultTableModel mod = new DefaultTableModel(new String[] {"Column 1", "Column 2"
    			, "Column 3", "Column 4", "Column 5", "Column 6", "Column 7", "Column 8"
    			, "Column 9", "Column 10", }, 0);
    	JTable tbl = new JTable(mod);
    	tbl.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    	JFrame frm = new JFrame("Demo Column Reorder problem");
    	frm.getContentPane().add(new JScrollPane(tbl));
    	frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	frm.setSize(250, 250);
    	frm.setVisible(true);
    }
    
	public static void main(String[] args) throws Exception {
		doTableTest();
	}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None that I have found yet.

Release Regression From : 5.0u9
The above release value was the last known release where this 
bug was not reproducible. Since then there has been a regression.