1. In showcase, there is a Server Internal Error popup when navigating to the Overview page of each ACE component - see attached screen shot; the other pages of each ACE component are not accessible.

The server log has many occurrences of this error:
10-Apr-2013 10:25:38 AM org.apache.myfaces.context.servlet.ServletExternalContextImpl setResponseContentType
SEVERE: Cannot set content type. Response already committed

Also visible in tomcat terminal window but not found in the logs:
java.lang.IllegalStateException: component with duplicate id "j_id__v_17" found
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:54)
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:75)
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:66)
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:35)
        at org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrate
gy.saveView(DefaultFaceletsStateManagementStrategy.java:549)
        at org.apache.myfaces.application.StateManagerImpl.saveView(StateManager
Impl.java:188)
        at javax.faces.application.StateManager.getViewState(StateManager.java:2
53)
        at org.icefaces.impl.context.DOMPartialViewContext.renderState(DOMPartia
lViewContext.java:619)
        at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPar
tialViewContext.java:247)
        at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:421)
        at javax.faces.component.UIComponentBase.encodeAll(UIComponentBase.java:
532)
        at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.rende
rView(FaceletViewDeclarationLanguage.java:1981)
        at org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandler
Impl.java:285)
        at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderRes
ponseExecutor.java:116)
        at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:
241)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:199)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:305)


2. basic application:
All browsers: Test Basic Application - A similar error message is displayed on the page when clicking on "Show/ Hide" button. Terminal window shows an error (not found in server logs):
INFO: MyFaces Unified EL support disabled
java.lang.IllegalStateException: component with duplicate id "j_id__v_6" found
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:54)
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:75)
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:66)
        at org.apache.myfaces.view.facelets.compiler.CheckDuplicateIdFaceletUtil
s.checkIdsStatefulComponents(CheckDuplicateIdFaceletUtils.java:35)
        at org.apache.myfaces.view.facelets.DefaultFaceletsStateManagementStrate
gy.saveView(DefaultFaceletsStateManagementStrategy.java:549)
        at org.apache.myfaces.application.StateManagerImpl.saveView(StateManager
Impl.java:188)
       ....................

3. fajax:
All browsers: fajax1 - Error message renders on the page when clicking on "Toggle test 1" or any button on the page. Terminal window shows a similar " java.lang.IllegalStateException: component with duplicate id" error.

4. elementUpdate:
All browsers: Input Elements Common - Error message renders on the page when clicking on "value" or any other button, and a " java.lang.IllegalStateException: component with duplicate id" error occurs in Tomcat terminal window.
                    Input Elements Individual - Error message renders on the page when clicking on "update" button, and a " java.lang.IllegalStateException: component with duplicate id" error occurs in Tomcat terminal window.