Calibre crashes upon opening LRF ebook file

[thedano]

64 bit Calibre on Win 8.1, error message when opening LRF ebook (tried a dozen that were known good in 1.X.X version)

calibre, version 2.0.0
ERROR: Unhandled exception: <b>AttributeError</b>:'Link' object has no attribute 'setAcceptsHoverEvents'

calibre 2.0 [64bit] isfrozen: True is64bit: True
Windows-8-6.2.9200 Windows ('64bit', 'WindowsPE')
('Windows', '8', '6.2.9200')
Python 2.7.8
Windows: ('8', '6.2.9200', '', 'Multiprocessor Free')
Traceback (most recent call last):
  File "site-packages\calibre\gui2\lrf_renderer\main.py", line 182, in parsed
  File "site-packages\calibre\gui2\lrf_renderer\document.py", line 460, in render
  File "site-packages\calibre\gui2\lrf_renderer\document.py", line 432, in render_chapter
  File "site-packages\calibre\gui2\lrf_renderer\document.py", line 63, in object_factory
  File "site-packages\calibre\gui2\lrf_renderer\text.py", line 186, in __init__
  File "site-packages\calibre\gui2\lrf_renderer\text.py", line 237, in populate
  File "site-packages\calibre\gui2\lrf_renderer\text.py", line 280, in end_line
  File "site-packages\calibre\gui2\lrf_renderer\text.py", line 468, in finalize
  File "site-packages\calibre\gui2\lrf_renderer\text.py", line 330, in __init__
AttributeError: 'Link' object has no attribute 'setAcceptsHoverEvents'