[Exist-open] Locked out of DB AGAIN, strange unwanted admin password change, how to reset it ?

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Update : reproducing the problem seems even more simple

Wipe the DB

the user admin now has an empty password

Go to the java client user manager, open admin user, you have 5 "dots" 
in each password fields ..
Press "Save"  => error message "wrong password" and you are locked out

The console I opened the client with displays

Exception in thread "AWT-EventQueue-0" 
java.lang.IllegalArgumentException: Cannot set a null TableModel
         at javax.swing.JTable.setModel(JTable.java:3681)
         at 
org.exist.client.security.UserManagerDialog.initComponents(UserManagerDialog.java:280)
         at 
org.exist.client.security.UserManagerDialog.<init>(UserManagerDialog.java:67)
         at 
org.exist.client.ClientFrame.editUsersAction(ClientFrame.java:1363)
         at 
org.exist.client.ClientFrame.access$15(ClientFrame.java:1359)
         at 
org.exist.client.ClientFrame$10.actionPerformed(ClientFrame.java:318)
         at 
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
         at 
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
         at 
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
         at 
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
         at 
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
         at 
java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
         at java.awt.Component.processMouseEvent(Component.java:6505)
         at 
javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
         at java.awt.Component.processEvent(Component.java:6270)
         at java.awt.Container.processEvent(Container.java:2229)
         at java.awt.Component.dispatchEventImpl(Component.java:4861)
         at java.awt.Container.dispatchEventImpl(Container.java:2287)
         at java.awt.Component.dispatchEvent(Component.java:4687)
         at 
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
         at 
java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
         at 
java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
         at java.awt.Container.dispatchEventImpl(Container.java:2273)
         at java.awt.Window.dispatchEventImpl(Window.java:2719)
         at java.awt.Component.dispatchEvent(Component.java:4687)
         at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:703)
         at java.awt.EventQueue.access$000(EventQueue.java:102)
         at java.awt.EventQueue$3.run(EventQueue.java:662)
         at java.awt.EventQueue$3.run(EventQueue.java:660)
         at java.security.AccessController.doPrivileged(Native Method)
         at 
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
         at 
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
         at java.awt.EventQueue$4.run(EventQueue.java:676)
         at java.awt.EventQueue$4.run(EventQueue.java:674)
         at java.security.AccessController.doPrivileged(Native Method)
         at 
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
         at java.awt.EventQueue.dispatchEvent(EventQueue.java:673)
         at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
         at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
         at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
         at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
         at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
         at 
java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

the server log contains
2013-04-11 23:16:16,869 [DefaultQuartzScheduler_Worker-3] INFO  
(NativeBroker.java [sync]:3658) - Memory: 502 464K total; 932 096K max; 
381 743K free
2013-04-11 23:16:16,870 [DefaultQuartzScheduler_Worker-3] INFO  
(BTree.java [printStatistics]:2336) - dom.dbx INDEX Buffers occupation : 
11 % (7 out of 64) Cache efficiency : 100 %
2013-04-11 23:16:16,870 [DefaultQuartzScheduler_Worker-3] INFO  
(DOMFile.java [printStatistics]:1369) - dom.dbx DATA Buffers occupation 
: 30 % (77 out of 256) Cache efficiency : 100 %
2013-04-11 23:16:16,870 [DefaultQuartzScheduler_Worker-3] INFO  
(BTree.java [printStatistics]:2336) - collections.dbx INDEX Buffers 
occupation : 6 % (4 out of 64) Cache efficiency : 100 %
2013-04-11 23:16:16,870 [DefaultQuartzScheduler_Worker-3] INFO  
(BFile.java [printStatistics]:434) - collections.dbx DATA Buffers 
occupation : 12 % (8 out of 64) Cache efficiency : 100 %
2013-04-11 23:16:16,870 [DefaultQuartzScheduler_Worker-3] INFO  
(BTree.java [printStatistics]:2336) - values.dbx INDEX Buffers 
occupation : 2 % (1 out of 64) Cache efficiency : N/A
2013-04-11 23:16:16,871 [DefaultQuartzScheduler_Worker-3] INFO  
(BFile.java [printStatistics]:434) - values.dbx DATA Buffers occupation 
: 0 % (0 out of 64) Cache efficiency : N/A
2013-04-11 23:17:46,636 [eXistThread-41] INFO  (Descriptor.java 
[<init>]:102) - Reading Descriptor from file C:\eXist\descriptor.xml
2013-04-11 23:17:51,596 [eXistThread-47] INFO  (Configurator.java 
[save]:1167) - Storing configuration 
/db/system/security/exist/accounts/admin.xml
2013-04-11 23:17:51,602 [eXistThread-47] INFO  (NativeBroker.java 
[removeXMLResource]:2694) - Removing document admin.xml (4) ...
2013-04-11 23:17:51,611 [eXistThread-47] INFO  (NativeBroker.java 
[sync]:3658) - Memory: 502 464K total; 932 096K max; 367 236K free
2013-04-11 23:17:51,612 [eXistThread-47] INFO  (BTree.java 
[printStatistics]:2336) - dom.dbx INDEX Buffers occupation : 11 % (7 out 
of 64) Cache efficiency : 100 %
2013-04-11 23:17:51,612 [eXistThread-47] INFO  (DOMFile.java 
[printStatistics]:1369) - dom.dbx DATA Buffers occupation : 30 % (77 out 
of 256) Cache efficiency : 100 %
2013-04-11 23:17:51,612 [eXistThread-47] INFO  (BTree.java 
[printStatistics]:2336) - collections.dbx INDEX Buffers occupation : 6 % 
(4 out of 64) Cache efficiency : 100 %
2013-04-11 23:17:51,612 [eXistThread-47] INFO  (BFile.java 
[printStatistics]:434) - collections.dbx DATA Buffers occupation : 12 % 
(8 out of 64) Cache efficiency : 100 %
2013-04-11 23:17:51,614 [eXistThread-47] INFO  (BTree.java 
[printStatistics]:2336) - values.dbx INDEX Buffers occupation : 2 % (1 
out of 64) Cache efficiency : N/A
2013-04-11 23:17:51,614 [eXistThread-47] INFO  (BFile.java 
[printStatistics]:434) - values.dbx DATA Buffers occupation : 0 % (0 out 
of 64) Cache efficiency : N/A
2013-04-11 23:17:51,619 [eXistThread-45] DEBUG 
(XmldbRequestProcessorFactory.java [authenticate]:90) - Wrong password 
for user [admin]

[Exist-open] Locked out of DB AGAIN, strange unwanted admin password change, how to reset it ?

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[Exist-open] Locked out of DB AGAIN, strange unwanted admin password change, how to reset it ?