Calibre 4.2.0 Windows 64-bit unable to save metadata

[jHamshaw]

Hi all - been using Calibre for years without issue, but on upgrading to ver 4.2.0 (Windows 64-bit) I can no longer edit/save metatdata. I've tried uninstall/reinstall, and the same with 4.1.x and get the same error each time (error log below). Can anyone help/suggest a fix please?

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calibre, version 4.2.0
ERROR: Unhandled exception: <b>error</b>:(3, 'CreateFileW', 'The system cannot find the path specified.')

calibre 4.2 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.18362-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.18362')
Python 2.7.16+
Windows: ('10', '10.0.18362', 'SP0', u'Multiprocessor Free')
Interface language: en_GB
Traceback (most recent call last):
File "site-packages\calibre\gui2\metadata\single.py", line 639, in accept
File "site-packages\calibre\gui2\metadata\single.py", line 614, in apply_changes
File "site-packages\calibre\gui2\metadata\basic_widgets.py", line 220, in commit
File "site-packages\calibre\db\legacy.py", line 820, in func
File "site-packages\calibre\db\cache.py", line 62, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1096, in set_field
File "site-packages\calibre\db\backend.py", line 1520, in windows_check_if_files_in_use
File "site-packages\calibre\utils\filenames.py", line 388, in __init__
error: (3, 'CreateFileW', 'The system cannot find the path specified.')

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[theducks]

This kind of thing is almost always your security software blocking the temp file storage.
See the FAQs for possible work arounds