When testing the QA panelStack applications /overview.jsf and /client.jsf an extra stackPane is rendered when dynamically changing which pane to open.
Not an issue with mojarra libs.
This is only happening when using myfaces libs in the QA test app and does not occur when using the showcase > ace:panelStack demos when built with myfaces libs.
The differences between the 2 applications are:
1.) showcase app is inside an ace:panel, ui:define and ui:compostion
2.) showcase bean scope is window and QA app is view

The QA panelStack application is found at:
http://dev.icesoft.com/svn/repo/qa/trunk/Regression-Icefaces4/Sparkle/Nightly/panelStack

A server error was seen only in Tomcat 8 while deploying the QA application built with myfaces libs:
05-May-2016 15:03:55.638 SEVERE [localhost-startStop-1] org.apache.catalina.sess
ion.StandardManager.doLoad standardManager.loading.ioe
 java.io.EOFException
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream
.java:2325)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputS
tream.java:2794)
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:801
)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299)
        at org.apache.catalina.util.CustomObjectInputStream.<init>(CustomObjectI
nputStream.java:56)
        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.ja
va:223)
        at org.apache.catalina.session.StandardManager.load(StandardManager.java
:180)
        at org.apache.catalina.session.StandardManager.startInternal(StandardMan
ager.java:460)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContex
t.java:5213)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:725)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:70
1)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:714)

        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:917)

        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:
1701)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:615)
        at java.lang.Thread.run(Thread.java:745)

05-May-2016 15:03:55.638 SEVERE [localhost-startStop-1] org.apache.catalina.sess
ion.StandardManager.startInternal Exception loading sessions from persistent sto
rage
 java.io.EOFException
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream
.java:2325)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputS
tream.java:2794)
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:801
)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:299)
        at org.apache.catalina.util.CustomObjectInputStream.<init>(CustomObjectI
nputStream.java:56)
        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.ja
va:223)
        at org.apache.catalina.session.StandardManager.load(StandardManager.java
:180)
        at org.apache.catalina.session.StandardManager.startInternal(StandardMan
ager.java:460)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContex
t.java:5213)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:725)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:70
1)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:714)

        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:917)

        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:
1701)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:47
1)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:615)
        at java.lang.Thread.run(Thread.java:745)