It opened up to my existing preset virtual library fine. I then went to Preferences - Behavior and received the below error.
Code:
calibre, version 0.9.27
ERROR: Unhandled exception: <b>AttributeError</b>:'ConfigWidget' object has no attribute 'opt_virtual_lib_on_startup'
Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\main.py", line 282, in show_plugin
File "site-packages\calibre\gui2\preferences\behavior.py", line 56, in genesis
File "site-packages\calibre\gui2\preferences\__init__.py", line 268, in register
File "site-packages\calibre\gui2\preferences\__init__.py", line 98, in __init__
AttributeError: 'ConfigWidget' object has no attribute 'opt_virtual_lib_on_startup'