[BrianNorman]

Before upgrade Calibre was working fine with two different Kindles. After the upgrade neither is detected.

I have updated Calibre to the latest version.

The devices are visible in Explorer and Device Manager.

No Ignored Devices set.

Interface plugin is enabled.

I tried changing the drive letter but it had no effect.

I tried a different USB port but it had no effect.

This is the debug log.

calibre 2.35 [64bit] isfrozen: True is64bit: True
Windows-8-6.2.9200 Windows ('64bit', 'WindowsPE')
('Windows', '8', '6.2.9200')
Python 2.7.9
Windows: ('8', '6.2.9200', '', 'Multiprocessor Free')
USB devices on system:
[u'usb\\vid_1949&pid_0004&rev_0100',
u'usb\\vid_1058&pid_071a&rev_2011',
u'usb\\root_hub20&vid8086&pid1c26&rev0004',
u'usb\\vid_8087&pid_0024&rev_0000',
u'usb\\vid_0461&pid_4e22&rev_0100',
u'usb\\vid_04a9&pid_1771&rev_0206&mi_01',
u'usb\\vid_04a9&pid_1771&rev_0206&mi_00',
u'usb\\root_hub20&vid8086&pid1c2d&rev0004',
u'usb\\vid_8087&pid_0024&rev_0000',
u'usb\\vid_413c&pid_2107&rev_0104',
u'usb\\vid_04a9&pid_1771&rev_0206']
Traceback (most recent call last):
File "site-packages\calibre\devices\scanner.py", line 85, in __call__
DriveError: No removable drives found
Drives detected:

No disabled plugins
Looking for devices of type: MTP_DEVICE
List of WPD PNP ids:
[u'\\\\?\\swd#wpdbusenum#{6b764261-7fb4-11e3-b109-c81f662c5345}#0000000000100000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}',
u'\\\\?\\swd#wpdbusenum#{1db98ce4-4518-11e5-9bc9-c81f662c5345}#0000000000002000#{6ac27878-a6fa-4155-ba85-f98f491d4f33}']
No suitable MTP devices found

Looking for devices of type: SMART_DEVICE_APP
All IP addresses {'{24B4194F-440D-11E5-9BC2-806E6F6E6963}': [{'addr': '127.0.0.1', 'netmask': '255.0.0.0', 'broadcast': '127.255.255.255'}], '{E0C39E85-415D-4364-96C2-4121C006C749}': [{'addr': '192.168.1.6', 'netmask': '255.255.255.0', 'broadcast': '192.168.1.255'}]}
No device is connected

Looking for devices...
u'usb\\vid_1949&pid_0004&rev_0100'

Devices possibly connected: None

This is on my Fathers pc. On my own I upgraded to Windows 10 and it works fine detecting the Kindle correctly.

Any advice appreciated.