New GUI error?

Has anything new added to the gui? I'm getting this when launching a match:
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An error has occured. You can copy/paste this message or save it to a file.
Please report this, plus what you tried to do, to:
http://www.slightlymagic.net/forum/viewforum.php?f=26
If you don't want to register an account, you can mail it directly to
mtgerror@yahoo.com
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Version:
Forge -- official beta: $Date: 2010-09-14 08:34:27 -0400 (Tue, 14 Sep 2010) $, SVN revision: $Revision: 2039 $
OS: Windows XP Version: 5.1 Architecture: x86
Java Version: 1.6.0_07 Vendor: Sun Microsystems Inc.
Detailed error trace:
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicOptionPaneUI.addButtonComponents(Unknown Source)
at javax.swing.plaf.basic.BasicOptionPaneUI.createButtonArea(Unknown Source)
at javax.swing.plaf.basic.BasicOptionPaneUI.installComponents(Unknown Source)
at javax.swing.plaf.basic.BasicOptionPaneUI.installUI(Unknown Source)
at javax.swing.JComponent.setUI(Unknown Source)
at javax.swing.JOptionPane.setUI(Unknown Source)
at javax.swing.JOptionPane.updateUI(Unknown Source)
at javax.swing.JOptionPane.<init>(Unknown Source)
at javax.swing.JOptionPane.showOptionDialog(Unknown Source)
at forge.GameAction.seeWhoPlaysFirst_CoinToss(GameAction.java:2707)
at forge.GameAction.newGame(GameAction.java:2556)
at forge.Gui_NewGame.startButton_actionPerformed(Gui_NewGame.java:587)
at forge.Gui_NewGame$11.actionPerformed(Gui_NewGame.java:421)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)