Query Results - failed with exclamation mark on icon

Hi there,
When I run a select query I now get an exclamation mark on the green arrow icon in the Query Results. I've been able to run this query before and no changes have been made.
In the Query Results window if I click the 'reload' icon (two blue arrows) the Output results flash up and then clear.
Version 3.0.02   //   Build MAIN-02.37   //   Java Platform 1.6.0_11
As far as I know I have not made any configuration or database connection changes. This issue appears on all DB connections and all SQL I try to run.
This appears to be the error:
java.lang.NullPointerException
    at oracle.dbtools.worksheet.sqlhistory.db.HistoryDB2.getRowFor(HistoryDB2.java:43)
    at oracle.dbtools.worksheet.sqlhistory.SqlEditorHistory.saveSql(SqlEditorHistory.java:85)
    at oracle.dbtools.worksheet.StatementRunnerResultsPanel$4.taskFinished(StatementRunnerResultsPanel.java:287)
    at oracle.dbtools.raptor.backgroundTask.RaptorTaskAdapter.stateChanged(RaptorTaskAdapter.java:95)
    at oracle.dbtools.raptor.backgroundTask.RaptorTaskDescriptor.notifyListener(RaptorTaskDescriptor.java:143)
    at oracle.dbtools.raptor.backgroundTask.RaptorTaskDescriptor.setStatus(RaptorTaskDescriptor.java:370)
    at oracle.dbtools.raptor.backgroundTask.RaptorTaskDescriptor.setStatus(RaptorTaskDescriptor.java:352)
    at oracle.dbtools.raptor.backgroundTask.RaptorTask.setStatus(RaptorTask.java:257)
    at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.done(RaptorTaskManager.java:479)
    at java.util.concurrent.FutureTask$Sync.innerSet(FutureTask.java:251)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:500)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Closing/reopening SQL Developer doesn't help. I've restarted my PC and the results do appear, but then the same error appears again.
Any help would be much appreciated. Thanks.

Hi Jon_Male,
A couple of points:
1. Your release is a bit out-of-date, plus it seems to be an early adopter release rather than the 3.0 production release (3.0.04.34).
2. The following old forum post discusses the same behavior occurring after an OutOfMemory error: exclamation mark on script output tab
Regards,
Gary
SQL Developer Team

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My mini ipod has taken me to my wits end. My ipod
always opens with a folder icon with an exclamation
mark. I can get it in to disk mode but my laptop
doesn't see it whether I'm using itunes, explorer, or
updater. When the mini ipod is plugged into my
laptop it displays 'do not disconnect' and the
circular arrows in the top left hand corner are
displayed but they aren't moving. I've been all over
the website but everything seems to assume I can
communicate with the **** thing. Restore seems to be
the preferred option but as I can't communicate with
it that isn't possible as far as I can see. This
happened when I tried to updated ipod software from
version 1.3 to version 1.4. It's not possible to go
back as I can't communicate with the ipod in order to
perform this task. It's going to get lobbed out of a
high building soon and replaced with a Sony......can
any get me out of this hole???
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Query Results - failed with exclamation mark on icon

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