KORG nanoKONTROL Studio MIDI over Bluetooth problem

Hi,
I'm trying to get my KORG nanoKONTROL Studio working with the current BlueZ 
stack (GIT as of May 3rd).
However, it seems the bonding fails for some reason.

May  3 19:48:30 Maui bluetoothd[32743]: src/adapter.c:bonding_attempt_complete() 
hci0 bdaddr 60:F1:89:28:DA:1F type 1 status 0x5
May  3 19:48:30 Maui bluetoothd[32743]: src/device.c:device_bonding_complete() 
bonding (nil) status 0x05
May  3 19:48:30 Maui bluetoothd[32743]: src/device.c:device_bonding_failed() 
status 5
May  3 19:48:30 Maui bluetoothd[32743]: src/adapter.c:resume_discovery()
May  3 19:48:30 Maui bluetoothd[32743]: src/adapter.c:dev_disconnected() Device 
60:F1:89:28:DA:1F disconnected, reason 2
May  3 19:48:30 Maui bluetoothd[32743]: src/adapter.c:adapter_remove_connection()
May  3 19:48:30 Maui bluetoothd[32743]: plugins/policy.c:disconnect_cb() reason 2
May  3 19:48:30 Maui bluetoothd[32743]: src/adapter.c:bonding_attempt_complete() 
hci0 bdaddr 60:F1:89:28:DA:1F type 1 status 0xe
May  3 19:48:30 Maui bluetoothd[32743]: src/device.c:device_bonding_complete() 
bonding (nil) status 0x0e
May  3 19:48:30 Maui bluetoothd[32743]: src/device.c:device_bonding_failed() 
status 14
May  3 19:48:30 Maui bluetoothd[32743]: src/adapter.c:resume_discovery()
May  3 19:48:30 Maui bluetoothd[32743]: MIDI I/O: Failed to read initial request

I do not have any thorough bluetooth skill. Could somebody look at the attached 
log and point me into some direction?
I restarted bluetoothd freshly with nothing in /var/lib/bluetooth.
Thanks in advance and best regards,
Robert