It seems Selenium tests are stuck on a particular test for an unknown reason. Moreover the timeout used for this wait is 7200 seconds! You can observe this in the server.log attached. The execution starts verifyWriteOnDocuments at 19:07:22,721 and is blocked on it till the next test at 21:03:41,848.
2013-08-06 19:04:08,034 WARN [http-bio-0.0.0.0-8080-exec-35] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium createUsers
2013-08-06 19:04:25,255 WARN [http-bio-0.0.0.0-8080-exec-19] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium createGroup
2013-08-06 19:04:37,615 WARN [http-bio-0.0.0.0-8080-exec-45] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium manageRightsUsersByAdmin
2013-08-06 19:04:49,109 WARN [http-bio-0.0.0.0-8080-exec-28] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium manageRightsUsersByManager
2013-08-06 19:05:07,782 WARN [http-bio-0.0.0.0-8080-exec-19] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyReadOnWorkspaces
2013-08-06 19:05:12,647 WARN [http-bio-0.0.0.0-8080-exec-48] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyManageOnWorkspaces
2013-08-06 19:05:18,619 WARN [http-bio-0.0.0.0-8080-exec-20] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium manageRightsInSectionsByAdmin
2013-08-06 19:05:28,077 WARN [http-bio-0.0.0.0-8080-exec-1] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium manageRightsInSectionsByManager
2013-08-06 19:05:47,805 WARN [http-bio-0.0.0.0-8080-exec-6] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyReadOnSections
2013-08-06 19:05:50,885 WARN [http-bio-0.0.0.0-8080-exec-6] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyManageOnSections
2013-08-06 19:05:55,465 WARN [http-bio-0.0.0.0-8080-exec-36] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium manageRightsGroups
2013-08-06 19:06:21,750 WARN [http-bio-0.0.0.0-8080-exec-39] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium modifyGroup
2013-08-06 19:06:31,095 WARN [http-bio-0.0.0.0-8080-exec-48] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium deleteGroup
2013-08-06 19:06:40,518 WARN [http-bio-0.0.0.0-8080-exec-6] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium modifyWorkspace
2013-08-06 19:06:48,153 WARN [http-bio-0.0.0.0-8080-exec-49] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium createNote
2013-08-06 19:06:54,581 WARN [http-bio-0.0.0.0-8080-exec-34] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium cancelNote
2013-08-06 19:07:01,488 WARN [http-bio-0.0.0.0-8080-exec-37] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium consultHistory
2013-08-06 19:07:08,232 WARN [http-bio-0.0.0.0-8080-exec-29] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyReadOnDocuments
2013-08-06 19:07:22,721 WARN [http-bio-0.0.0.0-8080-exec-6] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyWriteOnDocuments
2013-08-06 21:03:41,848 WARN [http-bio-0.0.0.0-8080-exec-32] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium createWSToDelete
2013-08-06 21:04:02,580 WARN [http-bio-0.0.0.0-8080-exec-37] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium deleteWorkspace
2013-08-06 21:04:21,215 WARN [http-bio-0.0.0.0-8080-exec-6] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium verifyDeletedDocumentContent
2013-08-06 21:04:33,894 WARN [http-bio-0.0.0.0-8080-exec-49] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium searchUsers
2013-08-06 21:04:37,729 WARN [http-bio-0.0.0.0-8080-exec-24] [com.sun.jersey.api.core.ResourceConfig] Class org.nuxeo.opensocial.webengine.gadgets.GadgetStreamWriter is ignored as an instance is registered in the set of singletons
2013-08-06 21:04:42,228 WARN [http-bio-0.0.0.0-8080-exec-32] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium searchGroup
2013-08-06 21:04:47,554 WARN [http-bio-0.0.0.0-8080-exec-6] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium lockDocument
2013-08-06 21:05:18,745 WARN [http-bio-0.0.0.0-8080-exec-24] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium addCommentOnLockedDocument
2013-08-06 21:05:49,310 WARN [http-bio-0.0.0.0-8080-exec-2] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium unlockDocumentByLocker
2013-08-06 21:06:20,038 WARN [http-bio-0.0.0.0-8080-exec-24] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium unlockDocumentByWSManager
2013-08-06 21:06:52,514 WARN [http-bio-0.0.0.0-8080-exec-37] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium blockRights
2013-08-06 21:07:26,591 WARN [http-bio-0.0.0.0-8080-exec-45] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium unblockRights
2013-08-06 21:08:07,856 WARN [http-bio-0.0.0.0-8080-exec-37] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium removeLocalRights
2013-08-06 21:08:15,347 WARN [http-bio-0.0.0.0-8080-exec-39] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium deleteUser
2013-08-06 21:08:29,718 WARN [http-bio-0.0.0.0-8080-exec-24] [org.nuxeo.ecm.platform.ui.web.restAPI.SystemLogRestlet] ----- Selenium createForum