[Manichean]

I'm getting the same error theducks is getting. 0.7.901, XP SP3, Cybook Gen3. Reproducible, occurs everytime the device is plugged in and Calibre tries to get metadata (at least, that's what it says in the jobs manager).
Full error report:
ERROR: FEHLER: Unbehandelte Ausnahme: <b>AttributeError</b>:'NoneType' object has no attribute 'split'

Traceback (most recent call last):
File "site-packages\calibre\gui2\__init__.py", line 297, in dispatch
File "site-packages\calibre\gui2\device.py", line 753, in metadata_downloaded
File "site-packages\calibre\gui2\device.py", line 1384, in set_books_in_library
File "site-packages\calibre\library\database2.py", line 593, in get_metadata
AttributeError: 'NoneType' object has no attribute 'split'

Edited to add: Should this matter, I only made a copy of my library on another computer and tested that, so metadata on the device should be the same as in the library.
Still further edited to add: After messing around with the amazing (Really! I love it to death!) S&R- function, I discovered that the last point obviously doesn't matter. Same error, different metadata. Also, I can't access any of the books on the device, and the "On device"- column isn't created. The buttons in the main toolbar for reader memory and expansion card appear correctly, though.
Next edit: This error also occurs when trying to connect to a folder (I wanted to try something without messing up the books on my device). Also, when trying to send books to said folder, I get another error, altough that may be a consequence of the first one:
ERROR: FEHLER: Unbehandelte Ausnahme: <b>AttributeError</b>:'list' object has no attribute 'add_book'

Traceback (most recent call last):
File "site-packages\calibre\gui2\__init__.py", line 297, in dispatch
File "site-packages\calibre\gui2\device.py", line 1287, in books_uploaded
File "site-packages\calibre\gui2\device.py", line 349, in add_books_to_metadata
File "site-packages\calibre\devices\usbms\driver.py", line 246, in add_books_to_metadata
AttributeError: 'list' object has no attribute 'add_book'

Last edit, I promise: For what it's worth, the books appear to get sent correctly.