Windows 8.1 64 bit
This is what I get from the debug mode:
Spoiler:
Running file type plugin YVES to ZIP failed with traceback:
Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 154, in _run_filetype_plugins
File "calibre_plugins.yves_input.__init__", line 33, in run
File "json\__init__.py", line 338, in loads
File "json\decoder.py", line 366, in decode
File "json\decoder.py", line 382, in raw_decode
ValueError: Unterminated string starting at: line 1 column 56320 (char 56319)
Added manifest to db in: 0.447000026703 seconds