[edjoe]

Since the last 2 updates I cannot download metadata any longer. I always get an error message:
calibre, version 3.10.0
ERROR: Unhandled exception: <b>IOError</b>:[Errno 5] Input/output error

calibre 3.10 embedded-python: True is64bit: True
Darwin-15.6.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '15.6.0', 'Darwin Kernel Version 15.6.0: Sun Jun 4 21:43:07 PDT 2017; root:xnu-3248.70.3~1/RELEASE_X86_64')
Python 2.7.12
OSX: ('10.11.6', ('', '', ''), 'x86_64')
Interface language: None
Traceback (most recent call last):
File "site-packages/calibre/gui2/actions/edit_metadata.py", line 114, in download_metadata
File "site-packages/calibre/ebooks/metadata/sources/update.py", line 21, in <module>
File "site-packages/calibre/utils/config.py", line 288, in __init__
File "site-packages/calibre/utils/config.py", line 316, in refresh
IOError: [Errno 5] Input/output error

Any help would be appreciated.
Thank you