Ah... In the job details you will see a message
Quote:
"Combining individual PDF parts...
Traceback (most recent call last):
File "site-packages\calibre\ebooks\pdf\writer.py", line 168, in _render_html
File "site-packages\calibre\ebooks\pdf\writer.py", line 149, in _render_book
File "site-packages\calibre\ebooks\pdf\writer.py", line 199, in _write
IOError: [Errno 24] Too many open files: u'c:\\users\\peter\\appdata\\local\\temp\\calibre_ 0.8.11_tmp_wuishv\\calibre_0.8.11_xltibw_pdf_outpu t_parts\\506.pdf'
PDF output written to c:\users\peter\appdata\local\temp\calibre_0.8.11_t mp_wuishv\calibre_0.8.11_mqspkr.pdf"
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Opened bug
https://bugs.launchpad.net/calibre/+bug/816616