I've been playing around with the IDP and global logout and found that an exception is thrown after the following steps:

1. Open a SP (e.g. http://localhost:8080/sales-post/)

2. Login

3. Logout with global logout (e.g. http://localhost:8080/sales-post?GLO=true)

4. Click in the address bar and press enter to reload the IDP without resubmitting data

5. Login

Instead of showing /hosted the following exception is thrown:

21:21:19,521 ERROR [org.picketlink.identity.federation] (http-localhost-127.0.0.1-8080-3) PLFED000253: Exception in processing request: org.picketlink.identity.federation.core.exceptions.ProcessingException: PLFED000102: Processing Exception
    at org.picketlink.identity.federation.PicketLinkLoggerImpl.processingError(PicketLinkLoggerImpl.java:85) [picketlink-jbas7-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.core.saml.v2.util.DocumentUtil.getDocument(DocumentUtil.java:208) [picketlink-core-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.api.saml.v2.request.SAML2Request.getSAML2ObjectFromStream(SAML2Request.java:163) [picketlink-core-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.web.util.IDPWebRequestUtil.getSAMLDocumentHolder(IDPWebRequestUtil.java:123) [picketlink-core-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.bindings.tomcat.idp.AbstractIDPValve.processSAMLRequestMessage(AbstractIDPValve.java:504) [picketlink-jbas7-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.bindings.tomcat.idp.AbstractIDPValve.invoke(AbstractIDPValve.java:383) [picketlink-jbas7-2.1.5.Final.jar:2.1.5.Final]
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:154) [jboss-as-web-7.1.0.Final.jar:7.1.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.10.Final.jar:]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.10.Final.jar:]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.10.Final.jar:]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.10.Final.jar:]
    at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_09]
Caused by: java.util.zip.ZipException: invalid code lengths set
    at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:164) [rt.jar:1.7.0_09]
    at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:122) [rt.jar:1.7.0_09]
    at org.apache.xerces.impl.XMLEntityManager$RewindableInputStream.read(XMLEntityManager.java:3032)
    at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:1012)
    at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:143)
    at org.apache.xerces.parsers.XML11Configuration.parse(XML11Configuration.java:802)
    at org.apache.xerces.parsers.XML11Configuration.parse(XML11Configuration.java:768)
    at org.apache.xerces.parsers.XMLParser.parse(XMLParser.java:108)
    at org.apache.xerces.parsers.DOMParser.parse(DOMParser.java:230)
    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:285)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121) [rt.jar:1.7.0_09]
    at org.picketlink.identity.federation.core.saml.v2.util.DocumentUtil.getDocument(DocumentUtil.java:202) [picketlink-core-2.1.5.Final.jar:2.1.5.Final]
    ... 13 more
 
21:21:19,544 ERROR [org.apache.catalina.connector.CoyoteAdapter] (http-localhost-127.0.0.1-8080-3) An exception or error occurred in the container during the request processing: java.lang.RuntimeException: PLFED000092: Null Value: Destination is null
    at org.picketlink.identity.federation.PicketLinkLoggerImpl.nullValueError(PicketLinkLoggerImpl.java:106) [picketlink-jbas7-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.web.util.PostBindingUtil.sendPost(PostBindingUtil.java:101) [picketlink-core-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.web.util.IDPWebRequestUtil.send(IDPWebRequestUtil.java:231) [picketlink-core-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.bindings.tomcat.idp.AbstractIDPValve.processSAMLRequestMessage(AbstractIDPValve.java:640) [picketlink-jbas7-2.1.5.Final.jar:2.1.5.Final]
    at org.picketlink.identity.federation.bindings.tomcat.idp.AbstractIDPValve.invoke(AbstractIDPValve.java:383) [picketlink-jbas7-2.1.5.Final.jar:2.1.5.Final]
    at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:154) [jboss-as-web-7.1.0.Final.jar:7.1.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.10.Final.jar:]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.10.Final.jar:]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.10.Final.jar:]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.10.Final.jar:]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.10.Final.jar:]
    at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_09]

I know these are not so common steps but anyway . I tried this with my open App and sales-post.war and idp.war from the Quickstarts.