Mac'n'Muse

Hello. Muse works fine with PC now, thank you for that. However with my (brand new) iMac nothing happens.

libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
calibre Debug log
calibre 2.14 isfrozen: True is64bit: True
Darwin-14.0.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '14.0.0', 'Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64')
Python 2.7.8
OSX: ('10.10.1', ('', '', ''), 'x86_64')
Starting up...
Started up in 36.03 seconds with 1197 books