Initially things looked very good with 10.11.1, but eventually the error came back.
22/10/15 01:10:04,877 com.apple.xpc.launchd[1]: (com.apple.xpc.launchd.domain.pid.MediaLibraryService.978) Path not allowed in target domain: type = pid, path = /Library/Frameworks/iTunesLibrary.framework/Versions/A/XPCServices/com.apple.iTunesLibraryService.xpc error = 147: The specified service did not ship in the requestor's bundle, origin = /System/Library/Frameworks/MediaLibrary.framework/Versions/A/XPCServices/com.apple.MediaLibraryService.xpc
22/10/15 01:10:04,884 com.apple.SecurityServer[77]: Session 100044 created
22/10/15 01:10:07,483 secd[341]: __SOSUpdateKeyInterest_block_invoke_2 Error getting ring interests (null)
22/10/15 01:10:07,607 CloudKeychainProxy[386]: __45-[UbiqitousKVSProxy doEnsurePeerRegistration]_block_invoke <UBKTse-C---> ensurePeerRegistration called, success ((null))
22/10/15 01:11:17,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:11:21,441 launchservicesd[75]: Application App:"Photos" asn:0x0-a00a pid:298 refs=7 @ 0x7fcbdb30c3d0 tried to be brought forward, but isn't in fPermittedFrontApps ( ( "LSApplication:0x0-0x2002 pid=92 "loginwindow"")), so denying. : LASSession.cp #1531 SetFrontApplication() q=LSSession 100007/0x186a7 queue
22/10/15 01:11:21,441 WindowServer[190]: [cps/setfront] Failed setting the front application to Photos, psn 0x0-0xa00a, securitySessionID=0x186a7, err=-13066
22/10/15 01:11:36,785 secd[341]: __SOSUpdateKeyInterest_block_invoke_2 Error getting ring interests (null)
22/10/15 01:11:36,875 CloudKeychainProxy[386]: __45-[UbiqitousKVSProxy doEnsurePeerRegistration]_block_invoke <UBKTse-C---> ensurePeerRegistration called, success ((null))
22/10/15 01:11:37,037 mapspushd[984]: [Warning] Services all disappeared, removing all accounts
22/10/15 01:11:37,037 mapspushd[984]: [Warning] Services all disappeared, removing all enabled accounts
22/10/15 01:11:37,037 mapspushd[984]: [Warning] Services all disappeared, removing all dependent devices
22/10/15 01:12:23,486 iTunes[975]: _send_message (thread 0x7fff788a2000): Could not securely send message size 406: SSL_ERROR_SYSCALL errno (Broken pipe).
22/10/15 01:12:23,486 iTunes[975]: AMDeviceStopSession (thread 0x7fff788a2000): Could not stop session with device 2: kAMDSendMessageError
22/10/15 01:13:41,163 Safari[302]: tcp_connection_tls_session_error_callback_imp 116 __tcp_connection_tls_session_callback_write_block_invoke.434 error 22
22/10/15 01:13:41,000 syslogd[41]: ASL Sender Statistics
22/10/15 01:14:44,018 iTunes[975]: _send_message (thread 0x700000947000): Could not securely send message size 406: SSL_ERROR_SYSCALL errno (Broken pipe).
22/10/15 01:14:44,019 iTunes[975]: AMDeviceStopSession (thread 0x700000947000): Could not stop session with device 2: kAMDSendMessageError
22/10/15 01:15:04,188 iTunes[975]: _send_message (thread 0x7fff788a2000): Could not securely send message size 406: SSL_ERROR_SYSCALL errno (Broken pipe).
22/10/15 01:15:04,188 iTunes[975]: AMDeviceStopSession (thread 0x7fff788a2000): Could not stop session with device 2: kAMDSendMessageError
22/10/15 01:15:26,534 iTunes[975]: _send_message (thread 0x7fff788a2000): Could not securely send message size 406: SSL_ERROR_SYSCALL errno (Broken pipe).
22/10/15 01:15:26,535 iTunes[975]: AMDeviceStopSession (thread 0x7fff788a2000): Could not stop session with device 2: kAMDSendMessageError
22/10/15 01:16:17,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:16:17,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:17:56,681 AddressBookSourceSync[985]: AOSKit WARN: Invalid url: https://arjen%40hiemstras.net@webdav.facebook.com/1660946793///arjen%40hiemstras.net@webdav.facebook.com/1660946793/
22/10/15 01:19:09,306 iTunes[975]: Entered:_AMMuxedDeviceDisconnected, mux-device:3
22/10/15 01:19:09,306 iTunes[975]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:3
22/10/15 01:19:09,306 iTunes[975]: tid:18943 - Mux ID not found in mapping dictionary
22/10/15 01:19:09,306 iTunes[975]: tid:18943 - Can't handle disconnect with invalid ecid
22/10/15 01:19:14,306 com.apple.usbmuxd[76]: LOCKDOWN_V2_BONJOUR_SERVICE_NAME is _apple-mobdev2._tcp,95060820
22/10/15 01:19:16,102 com.apple.usbmuxd[76]: _SendAttachNotification Device e0:b5:2d:0a:0f:1f@fe80::e2b5:2dff:fe0a:f1f._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.
22/10/15 01:19:16,102 com.apple.usbmuxd[76]: _SendAttachNotification Device e0:b5:2d:0a:0f:1f@fe80::e2b5:2dff:fe0a:f1f._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.
22/10/15 01:19:16,102 com.apple.usbmuxd[76]: _SendAttachNotification Device e0:b5:2d:0a:0f:1f@fe80::e2b5:2dff:fe0a:f1f._apple-mobdev2._tcp.local. has already appeared on interface 5. Suppressing duplicate attach notification.
22/10/15 01:20:04,828 CalendarAgent[306]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/plain; charset="utf-8"].]
22/10/15 01:20:04,946 CalendarAgent[306]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/plain; charset="utf-8"].]
22/10/15 01:21:17,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:23:58,000 syslogd[41]: ASL Sender Statistics
22/10/15 01:26:16,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:28:32,666 secd[341]: securityd_xpc_dictionary_handler cloudd[366] copy_matching Error Domain=NSOSStatusErrorDomain Code=-50 "query missing class name" (paramErr: error in user parameter list) UserInfo={NSDescription=query missing class name}
22/10/15 01:28:32,666 cloudd[366]: SecOSStatusWith error:[-50] Error Domain=NSOSStatusErrorDomain Code=-50 "query missing class name" (paramErr: error in user parameter list) UserInfo={NSDescription=query missing class name}
22/10/15 01:28:41,665 Safari[302]: tcp_connection_tls_session_error_callback_imp 119 __tcp_connection_tls_session_callback_write_block_invoke.434 error 22
22/10/15 01:31:16,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:34:20,000 syslogd[41]: ASL Sender Statistics
22/10/15 01:36:16,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:38:04,601 CalendarAgent[306]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/plain; charset="utf-8"].]
22/10/15 01:38:04,719 CalendarAgent[306]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/plain; charset="utf-8"].]
22/10/15 01:39:07,155 iTunes[975]: Entered:_AMMuxedDeviceDisconnected, mux-device:2
22/10/15 01:39:07,156 iTunes[975]: Entered:__thr_AMMuxedDeviceDisconnected, mux-device:2
22/10/15 01:39:07,156 iTunes[975]: tid:14f87 - BootedOS mode device disconnected
22/10/15 01:39:07,157 symptomsd[208]: nw_interface_create_with_name netutil_ifname_to_ifindex(en5) failed, dumping backtrace:
[x86_64] libnetcore-582.1.4
0 libsystem_network.dylib 0x00007fff8d742a05 __nw_create_backtrace_string + 123
1 libsystem_network.dylib 0x00007fff8d7638c7 nw_interface_create_with_name + 179
2 Network 0x00007fff88321130 -[NWInterface initWithInterfaceName:] + 120
3 SymptomEvaluator 0x00007fff8968c024 config_callback + 874
4 SystemConfiguration 0x00007fff98592e0f rlsPerform + 184
5 SystemConfiguration 0x00007fff985a614f __SCDynamicStoreSetDispatchQueue_block_invoke_2 + 52
6 libdispatch.dylib 0x00007fff8dac08f5 _dispatch_call_block_and_release + 12
7 libdispatch.dylib 0x00007fff8dab53c3 _dispatch_client_callout + 8
8 libdispatch.dylib 0x00007fff8dab9ff3 _dispatch_queue_drain + 754
9 libdispatch.dylib 0x00007fff8dac06bf _dispatch_queue_invoke + 549
10 libdispatch.dylib 0x00007fff8dab8d0b _dispatch_root_queue_drain + 538
11 libdispatch.dylib 0x00007fff8dab8ab8 _dispatch_worker_thread3 + 91
12 libsystem_pthread.dylib 0x00007fff8fb634f2 _pthread_wqthread + 1129
13 libsystem_pthread.dylib 0x00007fff8fb61375 start_wqthread + 13
22/10/15 01:39:07,157 symptomsd[208]: -[NWInterface initWithInterfaceName:] nw_interface_create_with_name(en5) failed, dumping backtrace:
[x86_64] libnetcore-582.1.4
0 libsystem_network.dylib 0x00007fff8d742a05 __nw_create_backtrace_string + 123
1 Network 0x00007fff8832119a -[NWInterface initWithInterfaceName:] + 226
2 SymptomEvaluator 0x00007fff8968c024 config_callback + 874
3 SystemConfiguration 0x00007fff98592e0f rlsPerform + 184
4 SystemConfiguration 0x00007fff985a614f __SCDynamicStoreSetDispatchQueue_block_invoke_2 + 52
5 libdispatch.dylib 0x00007fff8dac08f5 _dispatch_call_block_and_release + 12
6 libdispatch.dylib 0x00007fff8dab53c3 _dispatch_client_callout + 8
7 libdispatch.dylib 0x00007fff8dab9ff3 _dispatch_queue_drain + 754
8 libdispatch.dylib 0x00007fff8dac06bf _dispatch_queue_invoke + 549
9 libdispatch.dylib 0x00007fff8dab8d0b _dispatch_root_queue_drain + 538
10 libdispatch.dylib 0x00007fff8dab8ab8 _dispatch_worker_thread3 + 91
11 libsystem_pthread.dylib 0x00007fff8fb634f2 _pthread_wqthread + 1129
12 libsystem_pthread.dylib 0x00007fff8fb61375 start_wqthread + 13
22/10/15 01:39:07,158 symptomsd[208]: nw_interface_create_with_name netutil_ifname_to_ifindex(en5) failed, dumping backtrace:
[x86_64] libnetcore-582.1.4
0 libsystem_network.dylib 0x00007fff8d742a05 __nw_create_backtrace_string + 123
1 libsystem_network.dylib 0x00007fff8d7638c7 nw_interface_create_with_name + 179
2 Network 0x00007fff88321130 -[NWInterface initWithInterfaceName:] + 120
3 SymptomEvaluator 0x00007fff8968c024 config_callback + 874
4 SystemConfiguration 0x00007fff98592e0f rlsPerform + 184
5 SystemConfiguration 0x00007fff985a614f __SCDynamicStoreSetDispatchQueue_block_invoke_2 + 52
6 libdispatch.dylib 0x00007fff8dac08f5 _dispatch_call_block_and_release + 12
7 libdispatch.dylib 0x00007fff8dab53c3 _dispatch_client_callout + 8
8 libdispatch.dylib 0x00007fff8dab9ff3 _dispatch_queue_drain + 754
9 libdispatch.dylib 0x00007fff8dac06bf _dispatch_queue_invoke + 549
10 libdispatch.dylib 0x00007fff8dab8d0b _dispatch_root_queue_drain + 538
11 libdispatch.dylib 0x00007fff8dab8ab8 _dispatch_worker_thread3 + 91
12 libsystem_pthread.dylib 0x00007fff8fb634f2 _pthread_wqthread + 1129
13 libsystem_pthread.dylib 0x00007fff8fb61375 start_wqthread + 13
22/10/15 01:39:07,159 symptomsd[208]: -[NWInterface initWithInterfaceName:] nw_interface_create_with_name(en5) failed, dumping backtrace:
[x86_64] libnetcore-582.1.4
0 libsystem_network.dylib 0x00007fff8d742a05 __nw_create_backtrace_string + 123
1 Network 0x00007fff8832119a -[NWInterface initWithInterfaceName:] + 226
2 SymptomEvaluator 0x00007fff8968c024 config_callback + 874
3 SystemConfiguration 0x00007fff98592e0f rlsPerform + 184
4 SystemConfiguration 0x00007fff985a614f __SCDynamicStoreSetDispatchQueue_block_invoke_2 + 52
5 libdispatch.dylib 0x00007fff8dac08f5 _dispatch_call_block_and_release + 12
6 libdispatch.dylib 0x00007fff8dab53c3 _dispatch_client_callout + 8
7 libdispatch.dylib 0x00007fff8dab9ff3 _dispatch_queue_drain + 754
8 libdispatch.dylib 0x00007fff8dac06bf _dispatch_queue_invoke + 549
9 libdispatch.dylib 0x00007fff8dab8d0b _dispatch_root_queue_drain + 538
10 libdispatch.dylib 0x00007fff8dab8ab8 _dispatch_worker_thread3 + 91
11 libsystem_pthread.dylib 0x00007fff8fb634f2 _pthread_wqthread + 1129
12 libsystem_pthread.dylib 0x00007fff8fb61375 start_wqthread + 13
22/10/15 01:39:48,952 loginwindow[92]: ERROR | -[LWBuiltInScreenLockAuthLion closeAuthAndReset:] | Attempted to remove an observer when not observing
22/10/15 01:39:49,053 WindowServer[190]: CGXDisplayDidWakeNotification [6379103426408]: posting kCGSDisplayDidWake
22/10/15 01:39:49,054 WindowServer[190]: handle_will_sleep_auth_and_shield_windows: Deferring.
22/10/15 01:40:58,545 login[992]: USER_PROCESS: 992 ttys003
22/10/15 01:40:58,722 login[998]: USER_PROCESS: 998 ttys004
22/10/15 01:40:58,891 login[1004]: USER_PROCESS: 1004 ttys005
22/10/15 01:40:59,049 login[1010]: USER_PROCESS: 1010 ttys006
22/10/15 01:40:59,218 login[1016]: USER_PROCESS: 1016 ttys007
22/10/15 01:41:16,000 kernel[0]: hfs_clonefile: cluster_read failed - 34
22/10/15 01:41:38,575 login[1016]: DEAD_PROCESS: 1016 ttys007
22/10/15 01:41:38,583 Terminal[781]: BUG in libdispatch client: kevent[EVFILT_PROC] enable: "No such file or directory" - 0x2
22/10/15 01:41:40,033 login[1004]: DEAD_PROCESS: 1004 ttys005
I've logged a case with LaCie and with Apple. To be continued.