[Karen Myers]

Before I saw your suggestion, I rebooted. That gave me a 64-bit 2.0 instance that so-identified (yay!) and my database seemed fine (double yay!).

Plugged in my new Kobo Aura. Not detected by Calibre. (Windows also complains -- wants to format it as drive D: -- but the OS list of connected devices for ejection includes "eReader 3.3.0", so I assume the drivers are alright (but the Kobo PC utility doesn't see it either, so maybe not).

The two device plugins for Kobo are enabled.

I ran the Calibre Device Detection Debug and got this:

calibre 2.0 [64bit] isfrozen: True is64bit: True
Windows-7-6.1.7601-SP1 Windows ('64bit', 'WindowsPE')
('Windows', '7', '6.1.7601')
Python 2.7.8
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Successfully initialized third party plugins: DeDRM && K4PC, K4Mac, Kindle Mobi and Topaz DeDRM && Inept Epub DeDRM && Inept PDF DeDRM && Count Pages && eReader PDB 2 PML && Quality Check && Ignoble Epub DeDRM && Find Duplicates && Extract ISBN && Barnes & Noble && Kobo Utilities && User Category && Goodreads
USB devices on system:
[u'usb\\root_hub20&vid8086&pid1e2d&rev0004',
u'usb\\root_hub20&vid8086&pid1e26&rev0004',
u'usb\\vid_03f0&pid_8404&rev_0100',
u'usb\\vid_03f0&pid_8404&rev_0100&mi_00',
u'usb\\vid_03f0&pid_8404&rev_0100&mi_01',
u'usb\\vid_0480&pid_a003&rev_010?',
u'usb\\vid_0480&pid_a006&rev_0001',
u'usb\\vid_04e8&pid_6860&rev_0400',
u'usb\\vid_051d&pid_0002&rev_0090',
u'usb\\vid_059f&pid_1053&rev_0006',
u'usb\\vid_0c45&pid_6449&rev_2808',
u'usb\\vid_0c45&pid_6449&rev_2808&mi_00',
u'usb\\vid_2109&pid_2812&rev_9080',
u'usb\\vid_2109&pid_2812&rev_9080',
u'usb\\vid_2109&pid_2812&rev_8570',
u'usb\\vid_2109&pid_2812&rev_9080',
u'usb\\vid_2109&pid_2812&rev_9080',
u'usb\\vid_2109&pid_2812&rev_9080',
u'usb\\vid_2109&pid_2812&rev_9080',
u'usb\\vid_2237&pid_4203&rev_0110',
u'usb\\vid_2687&pid_fb01&rev_0100',
u'usb\\vid_2687&pid_fb01&rev_0100&mi_00',
u'usb\\vid_2687&pid_fb01&rev_0100&mi_01',
u'usb\\vid_413c&pid_8197&rev_0112',
u'usb\\vid_8087&pid_0024&rev_0000',
u'usb\\vid_8087&pid_0024&rev_0000']
Unable to get free space for drive: D
(87, 'GetDiskFreeSpaceEx', 'The parameter is incorrect.')
Drives detected:

No disabled plugins
Looking for devices of type: MTP_DEVICE
List of WPD PNP ids:
[u'\\\\?\\usb#vid_04e8&pid_6860#0b349b4f#{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\wpdbusenumroot#umb#2&37c186b&0&storage#vo lume#_??_usbstor#disk&ven_kobo&prod_ereader-3.3.0&rev_0110#514b3a3055840&0##{6ac27878-a6fa-4155-ba85-f98f491d4f33}']
MTP device: \\?\usb#vid_04e8&pid_6860#0b349b4f#{6ac27878-a6fa-4155-ba85-f98f491d4f33}

--- then it looks for my cellphone which is the only entry in the list of Ignored Devices (Kobo eReader not listed) ---

{'device_version': u'G870AUCU1ANG3',
'friendly_name': u'SAMSUNG-SM-G870A',
'has_bulk_properties': True,
'has_storage': True,
'manufacturer_name': u'Samsung Electronics Co., Ltd.',
'model_name': u'SAMSUNG-SM-G870A',
'protocol': u'MTP: 1.00',
'serial_number': u'R38F608ZJTV',
'storage': [{'capacity': 12316528640L,
'capacity_objects': 0L,
'description': u'Phone',
'filesystem': u'Generic hierarchical',
'free_objects': 0L,
'free_space': 10205106176L,
'id': u's10001',
'name': u'Phone',
'rw': True,
'type': u'fixed_ram'},
{'capacity': 62695079936L,
'capacity_objects': 0L,
'description': u'Card',
'filesystem': u'Generic hierarchical',
'free_objects': 0L,
'free_space': 62688395264L,
'id': u's20002',
'name': u'Card',
'rw': True,
'type': u'removable_ram'}],
'type': 'media player'}

Trying to open: \\?\usb#vid_04e8&pid_6860#0b349b4f#{6ac27878-a6fa-4155-ba85-f98f491d4f33}
This device has been blacklisted by the user
No suitable MTP devices found

Looking for devices...
u'usb\\vid_04e8&pid_6860&rev_0400'
u'usb\\vid_2237&pid_4203&rev_0110'

Devices possibly connected: None