I believe it to be a problem with the Spring Framework.  Here is a stack trace, 
I'm still getting random errors.  I was thinking of going back to version 3.5.1 
to see if the error is in there as well...

Stack Trace:
Oct 31, 2013 11:53:56 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet cas threw exception
java.lang.IllegalStateException: Cannot create a session after the response has 
been committed
        at org.apache.catalina.connector.Request.doGetSession(Request.java:2437)
        at org.apache.catalina.connector.Request.getSession(Request.java:2157)
        at 
org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
        at 
org.springframework.webflow.context.servlet.HttpSessionMap.getMutex(HttpSessionMap.java:98)
        at 
org.springframework.webflow.core.collection.LocalSharedAttributeMap.getMutex(LocalSharedAttributeMap.java:39)
        at 
org.springframework.webflow.conversation.impl.ContainedConversation.unlock(ContainedConversation.java:108)
        at 
org.springframework.webflow.execution.repository.support.ConversationBackedFlowExecutionLock.unlock(ConversationBackedFlowExecutionLock.java:55)
        at 
org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:178)
        at 
org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
        at 
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at 
org.jasig.cas.web.init.SafeDispatcherServlet.service_aroundBody2(SafeDispatcherServlet.java:128)
        at 
org.jasig.cas.web.init.SafeDispatcherServlet.service_aroundBody3$advice(SafeDispatcherServlet.java:57)
        at 
org.jasig.cas.web.init.SafeDispatcherServlet.service(SafeDispatcherServlet.java:1)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
com.github.inspektr.common.web.ClientInfoThreadLocalFilter.doFilter(ClientInfoThreadLocalFilter.java:63)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
        at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:311)
        at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)
        at 
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
        at 
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
        at java.lang.Thread.run(Unknown Source)
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