Multiple Editor Tabs in SQL Developer

I am on the current release of SQL Developer (1.5.4, build 5940). Every time I log into a database instance (doesn't seem to matter which instance), I get multiple code editor tabs. For example, if I log into an instance called 'ABC System', I'll get a tab labeled 'ABC System' and a 2nd tab labeled 'ABC System-1'.
It is not a serious problem, as I can delete one of the tabs and continue my work, but it is a bit of an annoyance. Has anyone else encountered this problem and know of a fix? Thank you very much.
Bernard Miller
University of Minnesota

Hi,
Once you have more than one tab open (frozen/pinned) in a connection's object viewer pane, just right-click on the tab and select "New Editor Tab Group". That tab is then placed in its own pane side-by-side with the original pane.
Regards,
Gary
SQL Developer Team

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    Oracle SQL Developer 2.1.1.64
    Version 2.1.1.64
    Build MAIN-64.45
    Copyright © 2005,2009 Oracle. All Rights Reserved.
    IDE Version: 11.1.1.2.36.55.30
    Product ID: oracle.sqldeveloper
    Product Version: 11.1.1.64.45
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    Oracle SQL Developer Extras     oracle.sqldeveloper.extras     1.1.1.64.45     Loaded
    Oracle SQL Developer Migrations     oracle.sqldeveloper.migration     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Antlr3 Translation Core     oracle.sqldeveloper.migration.translation.core_antlr3     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - DB2     oracle.sqldeveloper.migration.db2     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Microsoft Access     oracle.sqldeveloper.migration.msaccess     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - MySQL     oracle.sqldeveloper.migration.mysql     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - SQLServer     oracle.sqldeveloper.migration.sqlserver     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Sybase     oracle.sqldeveloper.migration.sybase     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Teradata     oracle.sqldeveloper.migration.teradata     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Translation Core     oracle.sqldeveloper.migration.translation.core     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Translation Db2     oracle.sqldeveloper.migration.translation.db2     11.1.1.64.45     Loaded
    Oracle SQL Developer Migrations - Translation UI     oracle.sqldeveloper.migration.translation.gui     11.1.1.64.45     Loaded
    Oracle SQL Developer Reports     oracle.sqldeveloper.report     11.1.1.64.45     Loaded
    Oracle SQL Developer SearchBar     oracle.sqldeveloper.searchbar     11.1.1.64.45     Loaded
    Oracle SQL Developer TimesTen     oracle.sqldeveloper.timesten     2.0.0.64.45     Loaded
    Oracle SQL Developer Unit Test     oracle.sqldeveloper.unit_test     11.1.1.64.45     Loaded
    Oracle SQL Developer Worksheet     oracle.sqldeveloper.worksheet     11.1.1.64.45     Loaded
    Oracle XML Schema Support     oracle.sqldeveloper.xmlschema     11.1.1.64.45     Loaded
    PROBE Debugger     oracle.jdeveloper.db.debug.probe     11.1.1.2.36.55.30     Loaded
    Peek     oracle.ide.peek     11.1.1.2.36.55.30     Loaded
    Persistent Storage     oracle.ide.persistence     11.1.1.2.36.55.30     Loaded
    QuickDiff     oracle.ide.quickdiff     11.1.1.2.36.55.30     Loaded
    Replace With     oracle.ide.replace     11.1.1.2.36.55.30     Loaded
    Runner     oracle.ide.runner     11.1.1.2.36.55.30     Loaded
    Snippet Window     oracle.sqldeveloper.snippet     11.1.1.64.45     Loaded
    Sql Monitoring Project     oracle.sqldeveloper.sqlmonitor     11.1.1.64.45     Loaded
    Tuning     oracle.sqldeveloper.tuning     11.1.1.64.45     Loaded
    User Extensions Support     oracle.sqldeveloper.userextensions     11.1.1.64.45     Loaded
    VHV     oracle.ide.vhv     11.1.1.2.36.55.30     Loaded
    Versioning Support     oracle.jdeveloper.vcs     11.1.1.2.36.55.30     Loaded
    Versioning Support for Subversion     oracle.jdeveloper.subversion     11.1.1.2.36.55.30     Loaded
    Virtual File System     oracle.ide.vfs     11.1.1.2.36.55.30     Loaded
    Web Browser and Proxy     oracle.ide.webbrowser     11.1.1.2.36.55.30     Loaded
    oracle.ide.indexing     oracle.ide.indexing     11.1.1.2.36.55.30     Loaded

    Yes this was clean directory (I reinstalled twice already). I'm using Oracle Database 10g express edition and also Oracle 10g Standard Edition (same problem for both databases).
    In the messages log I get:
    oracle.dbtools.raptor.oviewer.table.GridDataEditor java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
    ... and then each time I switch table:
    oracle.ide.model.IdeSubject Exception while updating observer[8]: Editor5

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