OK, I'm actually on Mac OS X 10.11.3. I get:
Paul:~ username$ /Applications/calibre.app/Contents/console.app/Contents/MacOS/calibre-debug -g
calibre 2.47 isfrozen: True is64bit: True
Darwin-15.3.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '15.3.0', 'Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:xnu-3248.30.4~1/RELEASE_X86_64')
Python 2.7.9
OSX: ('10.11.3', ('', '', ''), 'x86_64')
Successfully initialized third party plugins: DeDRM && EpubSplit && EpubMerge && Find Duplicates && KindleUnpack - The Plugin && Obok DeDRM && Count Pages
Starting up...
DEBUG: 0.0 obok::utilities.py - loading translations
DEBUG: 0.0 obok::dialogs.py - loading translations
DEBUG: 0.0 obok::config.py - loading translations
DEBUG: 0.0 obok::action_err.py - loading translations
Loaded cached store plugin for: Cdp.pl at version: 8
Loaded cached store plugin for: Ebookpoint at version: 6
Loaded cached store plugin for: Koobe at version: 5
Loaded cached store plugin for: Publio at version: 5
Loaded cached store plugin for: Virtualo at version: 6
EpubMerge
EBUG:calibre_plugins.epubmerge.epubmerg e_plugin(152):macmenuhack file_path:/Users/pdurrant/Library/Preferences/calibre/plugins/fanficfare_macmenuhack.txt
Started up in 3.82 seconds with 5896 books