[Turtle91]

EDIT: Correction, the following was for the 32bit version (sorry) but I also tried the 64bit version with the same results...I've added the 64bit error file at the end.
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I tried all the same stuff as the same thread for 3.1.0: restarts, uninstall, etc. I get the following error:

calibre, version 3.1.1
ERROR: Startup error: There was an error during calibre startup. Parts of calibre may not function. Click Show details to learn more.

Traceback (most recent call last):
File "site-packages\calibre\gui2\main.py", line 292, in initialize_db_stage2
File "site-packages\calibre\gui2\main.py", line 232, in start_gui
File "site-packages\calibre\gui2\ui.py", line 250, in initialize
File "site-packages\calibre\gui2\layout.py", line 330, in init_main_window_mixin
File "site-packages\calibre\gui2\actions\fetch_news.py", line 32, in init_scheduler
File "site-packages\calibre\gui2\dialogs\scheduler.py", line 587, in __init__
File "site-packages\calibre\web\feeds\recipes\model.py", line 148, in __init__
File "site-packages\calibre\web\feeds\recipes\collection.py", line 103, in get_builtin_recipe_collection
File "src/lxml/lxml.etree.pyx", line 3442, in lxml.etree.parse (src\lxml\lxml.etree.c:81716)
File "src/lxml/parser.pxi", line 1811, in lxml.etree._parseDocument (src\lxml\lxml.etree.c:118635)
File "src/lxml/parser.pxi", line 1837, in lxml.etree._parseDocumentFromURL (src\lxml\lxml.etree.c:118982)
File "src/lxml/parser.pxi", line 1741, in lxml.etree._parseDocFromFile (src\lxml\lxml.etree.c:117894)
File "src/lxml/parser.pxi", line 1138, in lxml.etree._BaseParser._parseDocFromFile (src\lxml\lxml.etree.c:112440)
File "src/lxml/parser.pxi", line 595, in lxml.etree._ParserContext._handleParseResultDoc (src\lxml\lxml.etree.c:105896)
File "src/lxml/parser.pxi", line 706, in lxml.etree._handleParseResult (src\lxml\lxml.etree.c:107604)
File "src/lxml/parser.pxi", line 646, in lxml.etree._raiseParseError (src\lxml\lxml.etree.c:106750)
XMLSyntaxError: None (builtin_recipes.xml, line 0)

Windows 10, 64
Attached is the debug

64bit error list.

calibre, version 3.1.1
ERROR: Startup error: There was an error during calibre startup. Parts of calibre may not function. Click Show details to learn more.

Traceback (most recent call last):
File "site-packages\calibre\gui2\main.py", line 292, in initialize_db_stage2
File "site-packages\calibre\gui2\main.py", line 232, in start_gui
File "site-packages\calibre\gui2\ui.py", line 250, in initialize
File "site-packages\calibre\gui2\layout.py", line 330, in init_main_window_mixin
File "site-packages\calibre\gui2\actions\fetch_news.py", line 32, in init_scheduler
File "site-packages\calibre\gui2\dialogs\scheduler.py", line 587, in __init__
File "site-packages\calibre\web\feeds\recipes\model.py", line 148, in __init__
File "site-packages\calibre\web\feeds\recipes\collection.py", line 103, in get_builtin_recipe_collection
File "src/lxml/lxml.etree.pyx", line 3442, in lxml.etree.parse (src\lxml\lxml.etree.c:81716)
File "src/lxml/parser.pxi", line 1811, in lxml.etree._parseDocument (src\lxml\lxml.etree.c:118635)
File "src/lxml/parser.pxi", line 1837, in lxml.etree._parseDocumentFromURL (src\lxml\lxml.etree.c:118982)
File "src/lxml/parser.pxi", line 1741, in lxml.etree._parseDocFromFile (src\lxml\lxml.etree.c:117894)
File "src/lxml/parser.pxi", line 1138, in lxml.etree._BaseParser._parseDocFromFile (src\lxml\lxml.etree.c:112440)
File "src/lxml/parser.pxi", line 595, in lxml.etree._ParserContext._handleParseResultDoc (src\lxml\lxml.etree.c:105896)
File "src/lxml/parser.pxi", line 706, in lxml.etree._handleParseResult (src\lxml\lxml.etree.c:107604)
File "src/lxml/parser.pxi", line 646, in lxml.etree._raiseParseError (src\lxml\lxml.etree.c:106750)
XMLSyntaxError: None (builtin_recipes.xml, line 0)