Missing Body Element errors with 6.1 RC1

I'm getting Missing Body Element errors with 6.1 RC1.

The workaround mentioned here is switch to default theme, but I'm not using a custom theme, the page was created with 6.0 using the default theme.

Also, when I try to edit the JSP file of these pages, I get the following exception:

java.lang.IllegalStateException: Illegal source modification with dirty model /home/fkj/NetBeansProjects/PortalTecnico/web/pages/contatim/ImportacaoContaTIM.jsp
    at org.netbeans.modules.visualweb.insync.SourceUnit.setSourceDirty(SourceUnit.java:304)
    at org.netbeans.modules.visualweb.insync.SourceUnit.insertUpdate(SourceUnit.java:379)
    at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.insertUpdate(PriorityDocumentListenerList.java:70)
    at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:185)
    at org.netbeans.editor.BaseDocument.fireInsertUpdate(BaseDocument.java:1398)
    at org.netbeans.editor.BaseDocument.insertString(BaseDocument.java:645)
    at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.insertString(BaseKit.java:1066)
    at org.netbeans.modules.web.core.syntax.JSPKit$JspDefaultKeyTypedAction.insertString(JSPKit.java:482)
    at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.actionPerformed(BaseKit.java:1030)
    at org.netbeans.editor.ext.ExtKit$ExtDefaultKeyTypedAction.actionPerformed(ExtKit.java:1002)
    at org.netbeans.modules.web.core.syntax.JSPKit$JspDefaultKeyTypedAction.actionPerformed(JSPKit.java:454)
    at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:290)
    at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1636)
    at javax.swing.JComponent.processKeyBinding(JComponent.java:2849)
    at javax.swing.JComponent.processKeyBindings(JComponent.java:2884)
    at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
    at java.awt.Component.processEvent(Component.java:5815)
    at java.awt.Container.processEvent(Container.java:2058)
    at java.awt.Component.dispatchEventImpl(Component.java:4410)
    at java.awt.Container.dispatchEventImpl(Container.java:2116)
    at java.awt.Component.dispatchEvent(Component.java:4240)
    at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
    at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
    at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
    at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
    at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
    at java.awt.Component.dispatchEventImpl(Component.java:4282)
    at java.awt.Container.dispatchEventImpl(Container.java:2116)
    at java.awt.Window.dispatchEventImpl(Window.java:2429)
    at java.awt.Component.dispatchEvent(Component.java:4240)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
    at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

Thanks for any help,
Felipe