Opening GPA fails with this error message:
The GPGME library returned an unexpected
error at confdialog.c:1459. The error was:
Unsupported protocol
This is either an installation problem or a bug in GPA.
GPA will now try to recover from this error.
Then it goes:
Fatal Error in GPGME library
(invoked from file options.c, line 302):
Unsupported protocol
The application will be terminated
(Windows 10 Pro, Version 1703, Compilation 15063.540)