I have the same issue. Splash screen loads but full UI won't load. Went through the FAQ steps but to no avail. Did you get yours to work? Below is output from command prompt:
Code:
calibre 6.29 embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.10.1
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
Failed to initialize plugin: 'C:\\Users\\name\\AppData\\Roaming\\calibre\\plugins\\DeDRM.zip'
Traceback (most recent call last):
File "calibre\customize\ui.py", line 777, in initialize_plugins
File "calibre\customize\ui.py", line 64, in load_plugin
File "calibre\customize\zipplugin.py", line 307, in load
File "importlib\__init__.py", line 126, in import_module
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "calibre\customize\zipplugin.py", line 199, in exec_module
File "calibre\customize\zipplugin.py", line 195, in get_code
File "calibre_plugins.dedrm.__init__", line 164
print u"{0} v{1}: Copying needed library files from plugin's zip".format(PLUGIN_NAME, PLUGIN_VERSION)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (2, 5, 0) && Package KFX (from KFX Input) (2, 5, 0) && Clean Metadata (0, 0, 6) && Count Pages (1, 13, 4) && Goodreads (1, 7, 9) && Goodreads Sync (1, 16, 3) && KFX metadata reader (from KFX Input) (2, 5, 0) && KFX Input (2, 5, 0) && Set KFX metadata (from KFX Output) (2, 3, 1) && KFX Output (2, 3, 1) && Kindle hi-res covers (0, 5, 0) && Quality Check (1, 13, 6)
QPA platform: windows
devicePixelRatio: 2.0
logicalDpi: 96.0 x 96.0
physicalDpi: 130.03412969283275 x 129.59183673469386
ApplicationPaletteChange event ignored
Using calibre Qt style: True
ApplicationPaletteChange event received
[0.00] Starting up...
[0.00] Showing splash screen...
[0.17] splash screen shown
[0.17] Initializing db...
[0.17] db initialized
[0.17] Constructing main UI...
[1.88] main UI initialized...
[1.88] Hiding splash screen
Starting QuickView
[2.03] splash screen hidden
[2.03] Started up in 2.03 seconds with 0 books