Export secret key from WinXP (GnuPG) 1.4.7 to AIX PGP Version 6.5.8 gives Bad Pass Phrase

[rlively]

Setup: 

Windows XP gpg (GnuPG) 1.4.7
Windows Privacy Tray
Version: 1.2.0 (Sep 17 2007)
Copyright (C) 2006 Timo Schulz <twoaday at freakmail.de>

AIX 5.3.0.0
Pretty Good Privacy(tm) Version 6.5.8
(c) 1999 Network Associates Inc.
Uses the RSAREF(tm) Toolkit, which is copyright RSA Data Security, Inc.
Export of this software may be restricted by the U.S. government.

-----

At first we generated keys on the AIX server and then exported the keys to
Windows, but PGP made RSA/IDEA keys which GnuPG can't decrypt, so I decided
to generate the keys on GnuPG on Windows and then export to the AIX server. 
I've tried it now multiple times with different keys, and each time I try to
edit the key or decrypt something I get errors on AIX.  I am absolutely sure
I am typing the pass phrase correctly, because I can do all of the same
things on Windows by typing the same pass phrase, and I even edited the key
to change the pass phrase multiple times to simple things (like abc123) and
then exported to AIX again and on AIX I still couldn't authenticate.

I can encrypt to the public key on AIX just fine. It's only when I need to
type the phass phrase that I get errors. What could be the problem?  I've
searched this forum, the documentation of both PGP and GnuPG, the web in
general, and I'm at a loss.

Key Info:

pub 1024D/4B84397F 9/15/2008 <userid>
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.7 (MingW32) - WinPT 1.2.0

1024-bit DSA Status OK C/S
2048-bit ELG Status OK E

Type: Key Pair
Key ID: 0x4B84397F
Algorithm: DSA/ELG
Size: 1024/2048 bits
Created: 9/15/2008
Expires: Never
Validity: Ultimate
Cipher: AES256
I trust ultimately (implicit)

Message when trying to decrypt on AIX:

Pretty Good Privacy(tm) Version 6.5.8
(c) 1999 Network Associates Inc.
Uses the RSAREF(tm) Toolkit, which is copyright RSA Data Security, Inc.
Export of this software may be restricted by the U.S. government.

File is encrypted.  Secret key is required to read it.

Key for user ID: <userid>
1024-bit DSS key, Key ID 0xxxxxxxxxF, created 2008/09/15
Key can sign.
You need a pass phrase to unlock your secret key.

Enter pass phrase:

received signal 11

[no cleartext file is created]

-----

Message when trying to key edit:
$ pgp -ke <userid>
Pretty Good Privacy(tm) Version 6.5.8
(c) 1999 Network Associates Inc.
Uses the RSAREF(tm) Toolkit, which is copyright RSA Data Security, Inc.
Export of this software may be restricted by the U.S. government.

Editing userid <userid> in default key ring

Key for user ID: <userid>
1024-bit DSS key, Key ID 0xxxxxxxxx, created 2008/09/15
Key can sign.

You need a pass phrase to unlock your secret key.
Key for user ID <userid>

Enter pass phrase:

Error:  Bad pass phrase.

You need a pass phrase to unlock your secret key.
Key for user ID <userid>

Enter pass phrase:

Error:  Bad pass phrase.

You need a pass phrase to unlock your secret key.
Key for user ID <userid>

Enter pass phrase:

Error:  Bad pass phrase.
No passphrase; secret key unavailable.
No secret key available.  Editing public key trust parameter.
This key/userID association is not certified.

Current trust for this key's owner is: untrusted

Make a determination in your own mind whether this key actually
belongs to the person whom you think it belongs to, based on available
evidence.  If you think it does, then based on your estimate of
that person's integrity and competence in key management, answer
the following question:

Would you trust <userid>
to act as an introducer and certify other people's public keys to you?
(1=I don't know (default). 2=No. 3=Usually. 4=Yes, always.) ? 4

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