I had tried to use a non-Admin-install of GPG4WIN 5.0.2 on WIndows Server 2016, but being unable to read anything (reported separately), I reinstalled version 4 in a different directory.
However from then on a new dialog pops up when a SSH key is to be unlocked by passphrase that seems to originate from GPG4WIN 5.x. The issue is that while the dialog pops up, it does not have input focus (as for version 4), so anything you type seems to end in nowhere until you click the popup to make it get the input focus.
Once unlocked the SSH key, the key “input into nowhere” appear in the PuTTY session.
Screenshots:
