[BetterRed]

FTR: I am running 1809 Pro.

Originally Posted by DaltonST

[*] Running as the default "Run as User", nothing happens at all since the auto-add worker process has no security permissions even to "read" the auto-add directory, much less to "write" (to delete).
[*] Running as "Run as Administrator" fixes the auto-add import, but the "write" (to delete) fails with a lack of security permissions. So, it auto-adds, but does not delete the auto-added files.
[*] The auto-add spawned worker process source code uses:

# Must have read and write permissions
 ===>>> os.access(os.path.join(self.path, x), os.R_OK|os.W_OK) and

[*] Running as User fails even os.R_OK.
[*] Running as Administrator passes os.R_OK but fails os.W_OK.

Never has been for me. Running as Admin never has caused any problems whatsoever for me since 2013. Also, Windows 10 1903 security permissions are a far cry from Windows 10 0001 and Windows 7 security permissions. Microsoft is strengthening them every month, and changing how it updates existing Windows 10 installations every month. Comparing an "old" Windows 10 installation to a "newly upgraded" Windows 10 1903 installation to a "fresh from the factory 1903 OEM installation" is comparing apples and oranges. Every installation is unique.

Sounds like a can of worms, it would be interesting to know if any other Windows 1903 users are experiencing similar problems.

Curious: what happens if you put a shortcut to calibre.exe into shell:sendto and use it to add books ?

Originally Posted by DaltonST

[*] I have Home, not Pro, so I can confirm nothing about Pro.

I wasn't sure if you might have sneaked in a 'test' of Pro when you used the MCT to create a fresh install of Windows

Originally Posted by DaltonST

[*] For Defender, I do not use the "Controlled Folder Access", so, no. Also, Defender real-time protection is turned off automatically by Windows 10 because I use another anti-virus application, Malwarebytes. Defender just runs "periodic scans" by itself.

Interesting: is that 'turning off automatically' a feature introduced in 1903, or is it a feature of Home. I run Defender and MWB and all options in both are on - and I only exclude one folder from either - my sweather tray app, which MWB thinks is a trojan.

Originally Posted by DaltonST

[*] I would love to know what version of Windows 10 (Home or Pro or both) and what build (1809 or 1903) Calibre is tested (and built) with, and whether or not Windows Update is active and allowed to run normally whenever it wishes to. Also, whether Calibre is tested using "Run as Administrator", "Run as User", or both.

FWIW - as a regular calibre user I run it under Pro. Windows Updates are allowed to run normally. Upgrades are deferred until 60 days after they're designated as Enterprise ready - so I don't expect to see 1903 until October/November.

BR