I have solved my own problem. If the gpg.conf has a setting for
personal-digest-preferences, and if an algo that is supported by a
smartcard is not first in the list, then GnuPG will fail with any
signing operation made with a smartcard.
For example, my gpg.conf setting was:
personal-digest-preferences SHA256 SHA384 SHA512
This was causing gnupg to fail with all signing operations. I don't
know whether or not this is a bug, or just an error message that is too
cryptic.
Kurt.
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