@DNSB: I just tried again to switch to safe mode (this time I verified that the network is on). And - no surprise anymore - it worked (both metadata and covers). Switching back to normal and I have my problems again. Disabling Kaspersky - no change. Still wondering why it worked at the beginning with the Calibre portable version, until Kaspersky was enabled again - and afterwards it made no difference anymore, if Kaspersky was enabled or disabled.
Most probably Kaspersky writes something somewhere (maybe to Windows Defender which automatically will be enabled when Kaspersky is disabled). Have to make further checks.
Regarding Dropbox, I have a local folder on my hard disk, that automatically will be synched with Dropbox. I never had any issues with this configuration. Same on macOS, my Dropbox files will be synched with a local directory.
Will further investigate tomorrow.
Thanks,
Claus
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