[Enigmail] gpg execution failed

[fishy]

Hi, from some day, enigmail always failed with a gpg execution, here's
the information from Console (while verifying some signed mail):

=====
Initializing Enigmail service ...
EnigmailAgentPath=/usr/local/bin/gpg

enigmail> /usr/local/bin/gpg --version --version --batch --no-tty --charset utf8
gpg (GnuPG) 1.4.8
Copyright (C) 2007 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Home: ~/.gnupg
Supported algorithms:
Pubkey: RSA, RSA-E, RSA-S, ELG-E, DSA
Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH
Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
Compression: Uncompressed, ZIP, ZLIB, BZIP2


enigmail> /usr/local/bin/gpg --charset utf8  --batch --no-tty --status-fd 2 --ke
yserver-options auto-key-retrieve --keyserver pgp.mit.edu, subkeys.pgp.net -d
usage: gpg [options] [filename]
enigmail.js: Enigmail.decryptMessageEnd: Error in command execution
=====

but when I try the "test" function (Debugging tab of the preference
Window), it says OK:

=====
EnigTest: START ********************************
EnigTest: To: fishywang at gmail.com
TEST MESSAGE 123
TEST MESSAGE 345


enigmail> /usr/local/bin/gpg --charset utf8  --batch --no-tty --status-fd 2 --co
mment 'Using GnuPG with Mozilla - http://enigmail.mozdev.org' -t --clearsign --p
assphrase-fd 0 --no-use-agent

************************************************
EnigTest: SIGNING ONLY
EnigTest: cipherText = -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

TEST MESSAGE 123
TEST MESSAGE 345
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.8 (Darwin)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkdrlYUACgkQ0WnNxKxiRs8L0QCglZq7vQS3ufklV/vnbABbjl0t
xGcAnjlkALeZmNo7119yPNsJksiVDQl3
=z0BX
-----END PGP SIGNATURE-----

EnigTest: exitCode = 0
************************************************
=====

I've tried GnuPG 1.4.8 from MacGPG, and 1.4.7 from MacPorts, all the same.

-- 
regards,
fishy