Quote:
Originally Posted by zkhcohen
See error:
calibre, version 4.0.0
ERROR: Loading book failed: Failed to open the book at C:\<PATH TO MY LIBRARY>\Books\Brown, Adrienne Maree\Pleasure Activism_ The Politics of (1051)\Pleasure Activism_ The Politics - Brown, Adrienne Maree.epub. Click "Show details" for more info.
Traceback (most recent call last):
File "site-packages\calibre\gui2\viewer\ui.py", line 248, in _load_ebook_worker
File "site-packages\calibre\gui2\viewer\convert_book.py", line 162, in prepare_book
WindowsError: [Error 5] Access is denied
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Something is blocking.
Is it (the file) open in another window? eg viewer
Will any other book convert?

That could be access denied for the Temp folder. Try disabling your A/V just for a test