[JDriver]

This is what I did:
Opened Calibre in debug mode
Selected a couple of books
Turned on Nexus and opened app
Connected
Went to pc and right clicked on books
Selected 'send to device'. First level options (send to main memory etc) grayed out
clicked 'set default send to device action'
selected main memory
waited
No success
Log attached:
calibre Debug log
calibre 0.8.64
Windows-7-6.1.7601-SP1
Windows
('Windows', '7', '6.1.7601')
Python 2.7.3
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Starting up...
QAccessibleWidget::rect: This implementation does not support subelements! (ID 2 unknown for QWidget)
QAccessibleWidget::rect: This implementation does not support subelements! (ID 2 unknown for QWidget)
Started up in 24.38 seconds with 6005 books
SMART_DEV ( 0.00: 0.000) startup_on_demand try port 9090
SMART_DEV ( 0.97: 0.811) startup_on_demand listening on port 9090
QAccessibleWidget::rect: This implementation does not support subelements! (ID 966 unknown for QWidget)
QAccessibleWidget::rect: This implementation does not support subelements! (ID 967 unknown for QWidget)
SMART_DEV ( 63.39: 62.357) reset
SMART_DEV ( 63.42: 0.000) set_progress_reporter
SMART_DEV ( 63.43: 0.000) open
SMART_DEV ( 63.47: 0.016) _call_client GET_INITIALIZATION_INFO
SMART_DEV ( 84.82: 21.340) _call_client device went away
Unable to open device <calibre.devices.smart_device_app.driver.SMART_DEV ICE_APP object at 0x03920490>
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 170, in do_connect
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 43, in _synchronizer
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 555, in open
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 376, in _call_client
ControlError: <unprintable ControlError object>

Connect to device failed, retrying in 5 seconds...
QAccessibleWidget::rect: This implementation does not support subelements! (ID 969 unknown for QWidget)
QAccessibleWidget::rect: This implementation does not support subelements! (ID 966 unknown for QWidget)
SMART_DEV ( 89.87: 5.012) reset
SMART_DEV ( 89.90: 0.000) set_progress_reporter
SMART_DEV ( 89.91: 0.000) open
Unable to open device <calibre.devices.smart_device_app.driver.SMART_DEV ICE_APP object at 0x03920490>
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 170, in do_connect
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 43, in _synchronizer
File "site-packages\calibre\devices\smart_device_app\driver.p y", line 536, in open
ControlError: <unprintable ControlError object>

Device connect failed again, giving up