[dirvine]

Oddly enough, in debug mode everything worked fine.

When I exited from debug mode and reopened calibre in regular mode the pipe error returned.

I realized that calibre outputs at least some of the same log messages to the mac console when it is in regular mode, and I hope that this will be of assistance to you. This is what I get from launching calibre then attempting to add one book to my read shelf (which also is supposed to add the rating and date to goodreads, remove a "to-read" tag from the book, and add a "read" tag):

4/14/16 10:05:42.918 PM calibre[816]: HttpHelper::__init__: proxy=None
4/14/16 10:05:42.952 PM calibre[816]: EpubMergeEBUG:calibre_plugins.epubmerge.epubmerg e_plugin(152):macmenuhack file_path:/Users/diane1/Library/Preferences/calibre/plugins/fanficfare_macmenuhack.txt
4/14/16 10:06:51.403 PM calibre[816]: HttpHelper::_oauth_request_post: url=http://www.goodreads.com/shelf/add_to_shelf.xml
4/14/16 10:06:51.413 PM calibre[816]: Client::request - uri=http://www.goodreads.com/shelf/add_to_shelf.xml, body=book_id=3413662&name=read
4/14/16 10:06:51.447 PM calibre[816]: HTTPConnectionWithTimeout::connect: Not using proxy
4/14/16 10:06:51.447 PM calibre[816]: HTTPConnectionWithTimeout::connect: (www.goodreads.com, 80)
4/14/16 10:06:51.531 PM calibre[816]: send: u'POST /shelf/add_to_shelf.xml HTTP/1.1\r\nHost: www.goodreads.com\r\nContent-Length: 246\r\nuser-agent: Python-httplib2/0.7.2 (gzip)\r\ncontent-type: application/x-www-form-urlencoded\r\naccept-encoding: gzip\r\n\r\noauth_signature_method=HMAC-SHA1&oauth_version=1.0&oauth_consumer_key=UxvtOM3o gQWjfgiCnMleA&oauth_timestamp=1460696811&oauth_non ce=85819156&oauth_token=RK49dfy9U7JPCjn3Kkw&oauth_ signature=4Vq92q0oxufuOnK%2Bt1YW3mxBQwc%3D&book_id =3413662&name=read'
4/14/16 10:06:51.808 PM calibre[816]: reply: 'HTTP/1.1 201 Created\r\n'
4/14/16 10:06:51.812 PM calibre[816]: header: Date: Fri, 15 Apr 2016 05:06:51 GMT
4/14/16 10:06:51.812 PM calibre[816]: header: Server: Server
4/14/16 10:06:51.812 PM calibre[816]: header: Content-Type: application/xml; charset=utf-8
4/14/16 10:06:51.812 PM calibre[816]: header: Status: 201 Created
4/14/16 10:06:51.813 PM calibre[816]: header: X-Frame-Options: ALLOWALL
4/14/16 10:06:51.813 PM calibre[816]: header: X-XSS-Protection: 1; mode=block
4/14/16 10:06:51.813 PM calibre[816]: header: X-Content-Type-Options: nosniff
4/14/16 10:06:51.813 PM calibre[816]: header: Location: http://www.goodreads.com/review/list/6523323?shelf=read
4/14/16 10:06:51.813 PM calibre[816]: header: X-Request-Id: 0SQGX7K03TD5H6RC1R0B
4/14/16 10:06:51.813 PM calibre[816]: header: ETag: W/"e36966be9d2eb3ebe033b5d229923f97-gzip"
4/14/16 10:06:51.815 PM calibre[816]: header: Cache-Control: max-age=0, private, must-revalidate
4/14/16 10:06:51.815 PM calibre[816]: header: X-Runtime: 0.176135
4/14/16 10:06:51.815 PM calibre[816]: header: X-Content-Type-Options: nosniff
4/14/16 10:06:51.815 PM calibre[816]: header: Set-Cookie: csid=BAhJIhg0NDEtNDAwMjQ0Ni0xMjY0OTk2BjoGRVQ%3D--f91262cd08d33b1908d397827c3d80c0a1a14b7b; path=/; expires=Tue, 15 Apr 2036 05:06:51 -0000
4/14/16 10:06:51.815 PM calibre[816]: header: Set-Cookie: locale=en; path=/
4/14/16 10:06:51.815 PM calibre[816]: header: Set-Cookie: _session_id2=54d5075b8ca8954f5c170fd06e75bf8c; path=/; expires=Fri, 15 Apr 2016 11:06:51 -0000; HttpOnly
4/14/16 10:06:51.815 PM calibre[816]: header: Vary: Accept-Encoding,User-Agent
4/14/16 10:06:51.816 PM calibre[816]: header: Content-Encoding: gzip
4/14/16 10:06:51.816 PM calibre[816]: header: Content-Length: 214
4/14/16 10:06:51.829 PM calibre[816]: HttpHelper::_oauth_request_post: url=http://www.goodreads.com/review/222256377.xml
4/14/16 10:06:51.837 PM calibre[816]: Client::request - uri=http://www.goodreads.com/review/222256377.xml, body=book_id=3413662&review%5Brating%5D=4&shelf=re ad
4/14/16 10:06:51.837 PM calibre[816]: send: u'PUT /review/222256377.xml HTTP/1.1\r\nHost: www.goodreads.com\r\nContent-Length: 47\r\nuser-agent: Python-httplib2/0.7.2 (gzip)\r\ncontent-type: application/x-www-form-urlencoded\r\nauthorization: OAuth realm="http://www.goodreads.com", oauth_token="RK49dfy9U7JPCjn3Kkw", oauth_signature="E8PMk7UVv0v2YEFEZv18UP1vCHk%3D", oauth_consumer_key="UxvtOM3ogQWjfgiCnMleA", oauth_timestamp="1460696811", oauth_nonce="35834319", oauth_body_hash="fWAT4HhH8ZSL%2BuS8ytYCeq%2F%2BrX4 %3D", oauth_version="1.0", oauth_
4/14/16 10:06:51.838 PM calibre[816]: send: u'PUT /review/222256377.xml HTTP/1.1\r\nHost: www.goodreads.com\r\nContent-Length: 47\r\nuser-agent: Python-httplib2/0.7.2 (gzip)\r\ncontent-type: application/x-www-form-urlencoded\r\nauthorization: OAuth realm="http://www.goodreads.com", oauth_token="RK49dfy9U7JPCjn3Kkw", oauth_signature="E8PMk7UVv0v2YEFEZv18UP1vCHk%3D", oauth_consumer_key="UxvtOM3ogQWjfgiCnMleA", oauth_timestamp="1460696811", oauth_nonce="35834319", oauth_body_hash="fWAT4HhH8ZSL%2BuS8ytYCeq%2F%2BrX4 %3D", oauth_version="1.0", oauth_
4/14/16 10:06:51.838 PM calibre[816]: send: u'PUT /review/222256377.xml HTTP/1.1\r\nHost: www.goodreads.com\r\nContent-Length: 47\r\nuser-agent: Python-httplib2/0.7.2 (gzip)\r\ncontent-type: application/x-www-form-urlencoded\r\nauthorization: OAuth realm="http://www.goodreads.com", oauth_token="RK49dfy9U7JPCjn3Kkw", oauth_signature="E8PMk7UVv0v2YEFEZv18UP1vCHk%3D", oauth_consumer_key="UxvtOM3ogQWjfgiCnMleA", oauth_timestamp="1460696811", oauth_nonce="35834319", oauth_body_hash="fWAT4HhH8ZSL%2BuS8ytYCeq%2F%2BrX4 %3D", oauth_version="1.0", oauth_
4/14/16 10:06:52.560 PM calibre[816]: calibre 2.50.1 isfrozen: True is64bit: True
4/14/16 10:06:52.561 PM calibre[816]: Darwin-14.5.0-x86_64-i386-64bit Darwin ('64bit', '')
4/14/16 10:06:52.561 PM calibre[816]: ('Darwin', '14.5.0', 'Darwin Kernel Version 14.5.0: Mon Jan 11 18:48:35 PST 2016; root:xnu-2782.50.2~1/RELEASE_X86_64')
4/14/16 10:06:52.561 PM calibre[816]: Python 2.7.9
4/14/16 10:06:52.561 PM calibre[816]: OSX: ('10.10.5', ('', '', ''), 'x86_64')
4/14/16 10:06:52.561 PM calibre[816]: Successfully initialized third party plugins: DeDRM && Count Pages && Modify ePub && EpubSplit && Goodreads Sync && EpubMerge
4/14/16 10:06:52.561 PM calibre[816]: Traceback (most recent call last):
4/14/16 10:06:52.561 PM calibre[816]: File "calibre_plugins.goodreads_sync.dialogs", line 1691, in action_button_clicked
4/14/16 10:06:52.561 PM calibre[816]: File "calibre_plugins.goodreads_sync.core", line 318, in update_review
4/14/16 10:06:52.562 PM calibre[816]: File "calibre_plugins.goodreads_sync.core", line 135, in _oauth_request_post
4/14/16 10:06:52.562 PM calibre[816]: File "calibre_plugins.goodreads_sync.oauth2.__init_ _", line 684, in request
4/14/16 10:06:52.562 PM calibre[816]: File "calibre_plugins.goodreads_sync.httplib2.__init__" , line 1453, in request
4/14/16 10:06:52.562 PM calibre[816]: File "calibre_plugins.goodreads_sync.httplib2.__init__" , line 1205, in _request
4/14/16 10:06:52.562 PM calibre[816]: File "calibre_plugins.goodreads_sync.httplib2.__init__" , line 1175, in _conn_request
4/14/16 10:06:52.562 PM calibre[816]: File "lib/python2.7/httplib.py", line 1073, in getresponse
4/14/16 10:06:52.562 PM calibre[816]: File "lib/python2.7/httplib.py", line 450, in begin
4/14/16 10:06:52.562 PM calibre[816]: IOError: [Errno 32] Broken pipe