Thank you for your effort to assist me. There are no error messages. Calibre just hangs with the "Adding Books" window showing 0 percent, and nothing more happens. The books are being added by pointing to the downloaded files, where Epub format books have been downloaded. As mentioned previously, I have been running Calibre for many years now, and this is the first time that it has failed. Also as mentioned, I stopped my antivirus software before attempting the adding of books, with same result. Any additional information needed, please let me know.
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