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Seems that the "Libraries" node does not have the associated Project in its lookup. Would probably be good to add it, so that you could e.g. close the project with Alt-F C while the Libraries node was selected in the Projects tab.
Checking in j2seproject/src/org/netbeans/modules/java/j2seproject/ui/J2SEPhysicalViewProvider.java; /cvs/java/j2seproject/src/org/netbeans/modules/java/j2seproject/ui/J2SEPhysicalViewProvider.java,v <-- J2SEPhysicalViewProvider.java new revision: 1.50; previous revision: 1.49 done Checking in j2seproject/src/org/netbeans/modules/java/j2seproject/ui/LibrariesNode.java; /cvs/java/j2seproject/src/org/netbeans/modules/java/j2seproject/ui/LibrariesNode.java,v <-- LibrariesNode.java new revision: 1.14; previous revision: 1.13 done