Perferences Subnode Doesn't Persist

I have a little program for which I'm using java.util.preferences for the first time. It works fine when saving to the root user node. But I recently tried to create a child node to save a list of files previously loaded. Writing to it works OK. I restart, and I see the files I loaded on the previous run. I can have a menu item to clear the list. That works at first. The menu clears and I can fetch the nodes to see that they've been removed. But when I restart the full list is back.
Here is the code the loads the preferences:
Preferences prefs = parrot.getPrefs().node(PROP_SEND_FILE);
try
for (String sKey: prefs.keys())
String sConfigString = prefs.get(sKey, null);
if ((null != sConfigString) && (0 < sConfigString.length()))
new SendFile(sConfigString);
catch (BackingStoreException bse)
Parrot.reportException("While loading send file prefs", bse);
Here is the code that sets the entries on exit:
Preferences prefs = m_parrot.getPrefs().node(PROP_SEND_FILE);
for (int i=0; i<10; i++)
SendFile sendFile = null;
if (i < m_lSendFiles.size())
sendFile = m_lSendFiles.get(i);
if (null != sendFile)
prefs.put(sendFile.getTitle(), sendFile.getConfigString());
Here is the code that clears the preferences:
for (JMenuItem item: m_hSendFiles.keySet())
m_sendMenu.remove(item);
Preferences prefs = m_parrot.getPrefs().node(PROP_SEND_FILE);
try
prefs.clear();
prefs.flush();
catch (Exception e) { Parrot.reportException(e); }
m_hSendFiles = new HashMap<JMenuItem, SendFile>();
m_nSendFileIndex = 0;
I've tried varous methods here, removing the node, removing each node separately and finally clearing the node as seen above. All yield approximately the same results. It's like the storage fails. Is there place that prefs storage errors get trapped?
Thanks in advance for the help, Dan

In case some other pilgrim has issues, here is a more detailed explanation.
Open System Preferences, follow the steps below and see what happens.
Preferences>Print & Fax, click on +, Add Printer window opens, click on printer to be added, then below the following items show up,
Name: HP DESKJET 840C
Location: MyMac or whatever, program supplies, don’t mess with
Print Using: Here you get to select Gutenprint or installed
Go into the Name: box, and put an A in front of the printer name that you want to be the first printer on whatever dropdown shows up when you want to print.
I renamed my HP LASERJET 1200 TO AHP LASERJET 1200 and my HP DESKJET 840C to BHP DESKJET 840C
NOW, if all is right, I should get the printers in the order I want!
C'mon Apple, this is bug not a feature!

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wolle wrote:
Hello, I'm using a T410 with Windows 7 professional german 64bit.
All Lenovo drivers/bios, MS hotfix are up2date.
When the Thinkvantage Tool is starting up I get two different messages.
The first nonsense error message stated:
"Das ursprüngliche Systemprofil wurde unter Einsatz von Deutsch zusammengestellt, aber ihr Computer
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Fehlerbucket 1042642550, Typ 5
Ereignisname: CLR20r3
Antwort: Nicht verfügbar
CAB-Datei-ID: 0
Problemsignatur:
P1: pcdr5cuiw32.exe
P2: 6.0.5450.12
P3: 4b7c85d1
P4: libAsapiCSharp
P5: 0.0.0.0
P6: 4b066e59
P7: e18
P8: 30
P9: System.ApplicationException
P10:
Angefügte Dateien:
C:\Users\wolle\AppData\Local\Temp\WER3AC0.tmp.WERInternalMetadata.xml
Diese Dateien befinden sich möglicherweise hier:
C:\ProgramData\Microsoft\Windows\WER\ReportArchive\AppCrash_pcdr5cuiw32.exe_8cd648aeacc4a6bcff206ecfb8786fd35bf8737d_0972952e
Analysesymbol:
Es wird erneut nach einer Lösung gesucht: 0
Berichts-ID: 2f06e5da-3142-11df-a9dd-00a0c6000000
Berichtstatus: 0
is saving his results. Now the hardware check is working fine without any error message, regards Wolle

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I was having a similar issue and I if I understand correctly, I think this is a solution for others..
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