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Hi, hope I'm doing this right. I have 3 devices, 2 of them are recognize and I have no problem adding ebooks but I got my son a Nextbook 7P12 but Calibre doesn't recognize it. I have my speakers plugged into a USB port and the Nextbook when I ran the debug.

calibre 1.17 isfrozen: True is64bit: False
Windows-Vista-6.0.6002-SP2 Windows ('32bit', 'WindowsPE')
('Windows', 'Vista', '6.0.6002')
Python 2.7.5
Windows: ('Vista', '6.0.6002', 'SP2', 'Multiprocessor Free')
USB devices on system:
[u'usb\\root_hub&vid1002&pid4389&rev0000',
u'usb\\root_hub&vid1002&pid438a&rev0000',
u'usb\\root_hub&vid1002&pid4387&rev0000',
u'usb\\root_hub&vid1002&pid4388&rev0000',
u'usb\\root_hub&vid1002&pid438b&rev0000',
u'usb\\root_hub20&vid1002&pid4386&rev0000',
u'usb\\vid_04a9&pid_1734&rev_0101',
u'usb\\vid_04a9&pid_1734&rev_0101&mi_00',
u'usb\\vid_04a9&pid_1734&rev_0101&mi_01',
u'usb\\vid_04f2&pid_b008&rev_0335',
u'usb\\vid_04f2&pid_b008&rev_0335&mi_00',
u'usb\\vid_18d1&pid_4e21&rev_0231']
Unable to get free space for drive: E
(21, 'GetDiskFreeSpaceEx', 'The device is not ready.')
Unable to get free space for drive: F
(21, 'GetDiskFreeSpaceEx', 'The device is not ready.')
Drives detected:

No disabled plugins
Looking for devices of type: MTP_DEVICE
List of WPD PNP ids:
[u'\\\\?\\wpdbusenumroot#umb#2&37c186b&0&storage#vo lume#1&19f7e59c&0&_??_usbstor#disk&ven_next7p12&pr od_-8g&rev____0#0123456789abcdef&0##{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\wpdbusenumroot#umb#2&37c186b&0&storage#vo lume#1&19f7e59c&0&_??_usbstor#disk&ven_next7p12&pr od_-8g&rev____0#0123456789abcdef&1##{6ac27878-a6fa-4155-ba85-f98f491d4f33}']
No suitable MTP devices found

Looking for devices...
u'usb\\vid_18d1&pid_4e21&rev_0231'

Devices possibly connected: None