The problem downloading from AO3 has reappeared, with four stories yesterday, and one today. I've pasted in the debug log for today's error below.
Hope it helps figure out what's going on. It's a nuisance.
Thanks
calibre Debug log
calibre 2.30 isfrozen: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.9
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Successfully initialized third party plugins: DeDRM && FanFicFare && EpubMerge
Starting up...
FFF

EBUG:calibre_plugins.fanficfare_plugin.fff_pl ugin(184):Plugin FanFicFare macmenuhack file_path:C:\Users\Elaine\AppData\Roaming\calibre\ plugins\fanficfare_macmenuhack.txt
macmenuhack file_path:C:\Users\Elaine\AppData\Roaming\calibre\ plugins\fanfictiondownloader_macmenuhack.txt
Started up in 22.26 seconds with 1376 books
FFF

EBUG:calibre_plugins.fanficfare_plugin.fff_pl ugin(828):FanFicFare v2.2.6
FFF

EBUG:calibre_plugins.fanficfare_plugin.fff_pl ugin(864):url:
http://archiveofourown.org/works/300214
FFF:INFO:calibre_plugins.fanficfare_plugin.fanficf are.adapters.adapter_archiveofourownorg(142):url:
http://archiveofourown.org/works/300214/navigate
FFF:INFO:calibre_plugins.fanficfare_plugin.fanficf are.adapters.adapter_archiveofourownorg(143):metau rl:
http://archiveofourown.org/works/300214
FFF

EBUG:calibre_plugins.fanficfare_plugin.fanfic fare.adapters.base_adapter(294):################## ###################
pagecache MISS:
http://archiveofourown.org/works/300214/navigate
FFF

EBUG:calibre_plugins.fanficfare_plugin.fanfic fare.adapters.base_adapter(294):################## ###################
pagecache MISS:
http://archiveofourown.org/works/300214
FFF:WARNING:calibre_plugins.fanficfare_plugin.fanf icfare.adapters.base_adapter(336):Caught an exception reading URL:
http://archiveofourown.org/works/300214 sleeptime(0) Exception IncompleteRead(0 bytes read, 2 more expected).
FFF

EBUG:calibre_plugins.fanficfare_plugin.fanfic fare.adapters.base_adapter(294):################## ###################
pagecache MISS:
http://archiveofourown.org/works/300214
FFF:WARNING:calibre_plugins.fanficfare_plugin.fanf icfare.adapters.base_adapter(336):Caught an exception reading URL:
http://archiveofourown.org/works/300214 sleeptime(0.5) Exception IncompleteRead(0 bytes read, 2 more expected).
FFF

EBUG:calibre_plugins.fanficfare_plugin.fanfic fare.adapters.base_adapter(294):################## ###################
pagecache MISS:
http://archiveofourown.org/works/300214
FFF:WARNING:calibre_plugins.fanficfare_plugin.fanf icfare.adapters.base_adapter(336):Caught an exception reading URL:
http://archiveofourown.org/works/300214 sleeptime(4) Exception IncompleteRead(0 bytes read, 2 more expected).
FFF

EBUG:calibre_plugins.fanficfare_plugin.fanfic fare.adapters.base_adapter(294):################## ###################
pagecache MISS:
http://archiveofourown.org/works/300214
FFF:WARNING:calibre_plugins.fanficfare_plugin.fanf icfare.adapters.base_adapter(336):Caught an exception reading URL:
http://archiveofourown.org/works/300214 sleeptime(9) Exception IncompleteRead(0 bytes read, 2 more expected).
FFF:ERROR:calibre_plugins.fanficfare_plugin.fanfic fare.adapters.base_adapter(338):Giving up on
http://archiveofourown.org/works/300214
FFF:ERROR:__init__.py(1193):IncompleteRead(0 bytes read, 2 more expected)
Traceback (most recent call last):
File "calibre_plugins.fanficfare_plugin.fanficfare.adap ters.base_adapter", line 328, in _fetchUrl
File "calibre_plugins.fanficfare_plugin.fanficfare.adap ters.base_adapter", line 299, in _fetchUrlRaw
File "urllib2.py", line 437, in open
File "calibre_plugins.fanficfare_plugin.fanficfare.gzip http", line 19, in http_response
File "socket.py", line 351, in read
File "httplib.py", line 549, in read
File "httplib.py", line 622, in _read_chunked
File "httplib.py", line 666, in _safe_read
IncompleteRead: IncompleteRead(0 bytes read, 2 more expected)
FFF:ERROR:calibre_plugins.fanficfare_plugin.dialog s(653):Exception: {u'author_sort': [u'Unknown'], u'url': u'http://archiveofourown.org/works/300214', u'site': 'archiveofourown.org', u'calibre_id': None, u'end': None, u'title': u'Unknown', u'comments': u'', u'listorder': 0, u'begin': None, u'good': False, u'comment': u'IncompleteRead(0 bytes read, 2 more expected)', u'added': False, u'pubdate': None, u'author': [u'Unknown']}:IncompleteRead(0 bytes read, 2 more expected)
Traceback (most recent call last):
File "calibre_plugins.fanficfare_plugin.dialogs", line 643, in do_loop
File "calibre_plugins.fanficfare_plugin.fff_plugin" , line 975, in prep_download_loop
File "calibre_plugins.fanficfare_plugin.fanficfare.adap ters.base_adapter", line 399, in getStoryMetadataOnly
File "calibre_plugins.fanficfare_plugin.fanficfare.adap ters.base_adapter", line 462, in doExtractChapterUrlsAndMetadata
File "calibre_plugins.fanficfare_plugin.fanficfare.adap ters.adapter_archiveofourownorg", line 147, in extractChapterUrlsAndMetadata
File "calibre_plugins.fanficfare_plugin.fanficfare.adap ters.base_adapter", line 340, in _fetchUrl
IncompleteRead: IncompleteRead(0 bytes read, 2 more expected)