Calibre not detecting Nexus 7

Hello,

I can't get Calibre to see my Nexus 7 (Android firmware JZO54K version 4.1.2). I am running Calibre 0.9.4 under Windows 7 64 bit.

Here is the relevant debug output:

MTP device: \\?\usb#vid_18d1&pid_4e42&mi_00#7&b928a4a&0&0000#{ 6ac27878-a6fa-4155-ba85-f98f491d4f33}
{'device_version': u'1.0',
'friendly_name': u'',
'has_bulk_properties': True,
'has_storage': True,
'manufacturer_name': u'asus',
'model_name': u'Nexus 7',
'protocol': u'MTP: 1.00',
'serial_number': u'015d24a81b43f603',
'storage': [],
'type': 'media player'}
Not a suitable MTP device, ignoring

No suitable MTP devices found