[spamalamaham]

I decided to finally update my calibre (ver 3.xx) to the latest (7.22) and found it does not start. I considered that it may be jumping to many versions so I tried 6xx, 5xx, 4xx without any improvement. Uninstalling and going back to 3.48 is the furthest I can go that opens.

Debug on 4.0 shows:
calibre 4.0 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.19041-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19041')
Python 2.7.16+
Windows: ('10', '10.0.19041', 'SP0', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 3)
Turning on automatic hidpi scaling
Registering with default programs...
Registered with default programs in 0.7 seconds


3.48 running no problem gives:
calibre 3.48 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.19041-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19041')
Python 2.7.15+
Windows: ('10', '10.0.19041', 'SP0', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 3)
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 93.9653179191 x 94.0740740741
Using calibre Qt style: True
[0.00] Starting up...
[0.00] Showing splash screen...
[0.09] splash screen shown
[0.09] Initializing db...
[0.19] db initialized
[0.19] Constructing main UI...
[1.05] main UI initialized...
[1.05] Hiding splash screen
[1.42] splash screen hidden
[1.42] Started up in 1.42 seconds with 1679 books

Thanks in advance!