After upgrading to Seam 3.1.0.CR1, the problem persists, but not fatally.  The user's session is gone, and the web view appears normal, but the log contains the same stack trace.  All appears fine in the browser, but something is still not correct underneath.

All I am doing is logging in and immediately logging out.  Any ideas?

08:54:28,489 TRACE [com.bp.cpr.pn.framework.security.SecurityManagerBean] (http--0.0.0.0-8080-4) User admin logged in successfully.
08:54:47,300 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (http--0.0.0.0-8080-4) #{portalSecurityManager.logout}: org.jboss.weld.exceptions.IllegalProductException: WELD-000052 Cannot return null from a non-dependent producer method:  [method] @Produces @RequestScoped protected org.jboss.solder.servlet.http.ImplicitHttpServletObjectsProducer.getHttpSession(): javax.faces.FacesException: #{portalSecurityManager.logout}: org.jboss.weld.exceptions.IllegalProductException: WELD-000052 Cannot return null from a non-dependent producer method:  [method] @Produces @RequestScoped protected org.jboss.solder.servlet.http.ImplicitHttpServletObjectsProducer.getHttpSession()
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
     at javax.faces.component.UICommand.broadcast(UICommand.java:315) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
     at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:67) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:126) [prettyfaces-jsf2-3.3.2.jar:]
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:139) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
     at org.jboss.as.web.NamingValve.invoke(NamingValve.java:57) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
     at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:49) [jboss-as-jpa-7.0.2.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:154) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:667) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:952) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at java.lang.Thread.run(Thread.java:680) [:1.6.0_29]
Caused by: javax.faces.el.EvaluationException: org.jboss.weld.exceptions.IllegalProductException: WELD-000052 Cannot return null from a non-dependent producer method:  [method] @Produces @RequestScoped protected org.jboss.solder.servlet.http.ImplicitHttpServletObjectsProducer.getHttpSession()
     at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
     ... 28 more
Caused by: org.jboss.weld.exceptions.IllegalProductException: WELD-000052 Cannot return null from a non-dependent producer method:  [method] @Produces @RequestScoped protected org.jboss.solder.servlet.http.ImplicitHttpServletObjectsProducer.getHttpSession()
     at org.jboss.weld.bean.AbstractProducerBean.checkReturnValue(AbstractProducerBean.java:256) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.jboss.weld.bean.AbstractProducerBean.create(AbstractProducerBean.java:362) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.jboss.weld.context.AbstractContext.get(AbstractContext.java:122) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:99) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:124) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.jboss.weld.proxies.HttpSession$1681475766$Proxy$_$$_WeldClientProxy.invalidate(HttpSession$1681475766$Proxy$_$$_WeldClientProxy.java)
     at org.jboss.seam.security.IdentityImpl.logout(IdentityImpl.java:424) [seam-security-3.1.0.CR1.jar:]
     at org.jboss.seam.security.IdentityImpl$Proxy$_$$_WeldClientProxy.logout(IdentityImpl$Proxy$_$$_WeldClientProxy.java) [seam-security-3.1.0.CR1.jar:]
     at com.bp.cpr.pn.application.onepcoe.security.PortalSecurityManager.logout(PortalSecurityManager.java:153) [classes:]
     at com.bp.cpr.pn.application.onepcoe.security.PortalSecurityManager$Proxy$_$$_WeldClientProxy.logout(PortalSecurityManager$Proxy$_$$_WeldClientProxy.java) [classes:]
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_29]
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_29]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_29]
     at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_29]
     at org.apache.el.parser.AstValue.invoke(AstValue.java:196) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
     at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:43) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:56) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
     at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
     at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
     ... 29 more

I am using JBoss AS 7.0.2.

Perhaps, my architecture is what is causing the problem:  JSF action calls session scoped PortalSecurityManager.logout.  PortalSecurityManager has injected SLSB SecurityManager and calls securityManager.logout().  SecurityManagerBean injects Identity and calls identity.logout(); This is the point where I get the WELD exception.  Note:  PortalSecurityManager is in a WAR; the SecurityManager is in  an EJB; Seam Security and other dependent Seam modules are in the lib directory of the EAR.  BTW: This has been working with Seam 3.0.0.Final (although, the IdentityImpl.logout() did not invalidate the session in Seam Security 3.0.0.Final).

As a temporary workaround, I wrap the "identity.logout" call in a try block in the SecurityManagerBean (SLSB), eat the exception, and then invalidate the session in the PortalSecurityManager following the return from the SecurityManager.

     public String logout() {
          // This is a hack to get around WELD-00052 error.
          try {
               identity.logout();
          } catch (Exception e) {
               logger.errorf("Exception logging out ...%s", e.getMessage());
          }
          return SecurityManager.LOGOUT_SUCCESS;
     }

On return from the logout call, the calling PortalSecurityManager  calls:
          FacesContext.getCurrentInstance().getExternalContext().invalidateSession();

This sequence of calls seems to work for me ... although eating the exception is definitely not what should be done. I found that I must invalidate the session on return because the identity.logout() call does not do it, although the call to invalidate the session is in the source code for IdentityImpl.  The exception must be occurring prior to or during the session invalidate call in IdentityImpl.logout().