Unhandled exception when hiding cover grid

[R. Scot Johns]

On clicking the Hide Cover Grid switch in lower-right Layout options, I receive an AttributeError and the program freezes and cannot be interacted with further, but must be shut down from Task Manager.

Error message reads: AttributeError:'builtin_function_or_method' object has no attribute 'lower'

This is actually the first time I've tried to hide the cover grid in probably a year.

Using Calibre 3.40.0 on Windows 10 desktop pc.

I have attached a screenshot of the error message.

[Kovid Goyal (kovid)]

Please click the Show details button on the error message and post the details here.

[R. Scot Johns (rscotjohns)]

calibre, version 3.40.0
ERROR: Unhandled exception: <b>AttributeError</b>:'builtin_function_or_method' object has no attribute 'lower'

calibre 3.40 embedded-python: True is64bit: False
Windows-10-10.0.17134-SP0 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '10', '10.0.17134')
Python 2.7.15+
Windows: ('10', '10.0.17134', 'SP0', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 14, 0) && DeDRM (6, 6, 0) && Package KFX (from KFX Input) (1, 14, 0) && KFX metadata reader (from KFX Input) (1, 14, 0) && KFX Input (1, 14, 0) && Set KFX metadata (from KFX Output) (1, 28, 0) && KFX Output (1, 28, 0)
Traceback (most recent call last):
  File "site-packages\calibre\gui2\library\delegates.py", line 447, in displayText
  File "site-packages\calibre\utils\date.py", line 358, in format_date
AttributeError: 'builtin_function_or_method' object has no attribute 'lower'

[Kovid Goyal (kovid)]

Update to 3.40.1 and you should be fine.

 status fixreleased

[R. Scot Johns (rscotjohns)]

Working fine now. Thanks!