pgp5 doesn't like my gnupg signatures

[Martin Lucina]

Hi all

I've just decided try GnuPG, now that 1.0.0 is out. Unfortunately I can't
seem to get it to sign messages properly. When I sign a message and then
check the signature using pgp5 I get:

[-- PGP output follows (current time: Thu Oct 14 08:59:22 1999) --]
BAD signature made 1999-10-14 06:52 GMT by key:
  1024 bits, Key ID 61F2637C, Created 1999-10-14
   "Martin Lucina <mato@kotelna.sk>"
This signature applies to another message
[-- End of PGP output --]

However if I check this signature again using GnuPG, it says it's correct.
This is all using mutt as my MUA.

What is the problem here?

(Please Cc: to me, I am not on this list)
-- 
Martin Lucina http://www.kotelna.sk/mato/ Wellington, New Zealand
I've always been mad I know I've been mad like the most of us are 
Pretty hard to explain why you're a madman even if you're not mad