After deleting an re-adding my novels with the Extended driver, I have found several that would give parsing errors / failure to communicate with device. These were files that would upload without problem using the Kobo Touch driver.
Example: The Adventures of Sherlock Holmes
Code:
calibre, version 0.9.33
ERROR: Error: Error communicating with device
Failed to parse 'The Adventures of Sherlock Holmes' by 'Sir Arthur Conan Doyle' with error: ''unicode' object has no attribute 'xpath'' (file: calibre_plugins.kobotouch_extended.container, line: 560)
Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 85, in run
File "site-packages/calibre/gui2/device.py", line 557, in _upload_books
File "calibre_plugins.kobotouch_extended.driver", line 264, in upload_books
InvalidEPub: Failed to parse 'The Adventures of Sherlock Holmes' by 'Sir Arthur Conan Doyle' with error: ''unicode' object has no attribute 'xpath'' (file: calibre_plugins.kobotouch_extended.container, line: 560)
Joel, let me know if you want this book / file.