[touring]

Hi

I have never been able to connect my Kobo touch with any version of Calibre, getting an error:
ERROR: Error: Error communicating with device
[Errno 22] Invalid argument
Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 81, in run
File "site-packages\calibre\gui2\device.py", line 332, in _books
File "site-packages\calibre\devices\kobo\driver.py", line 336, in books
File "site-packages\calibre\devices\kobo\driver.py", line 816, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 386, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 385, in write_prefix
File "site-packages\calibre\ebooks\metadata\book\json_codec.p y", line 119, in encode_to_file
IOError: [Errno 22] Invalid argument

I am running the current version, and have disabled the metadata reade rplugin, and unticked "read metadata" on the Kobo plugin.

Tried deleting the two Calibre files, and have culled any books over 6Mb from the library (about 800 books). Also ran the Calibre "check library function"

Does anyone have any suggestions on what else I should try?