Signing a message for more than 1 recipient name.

[NirinaMichel Ratoandromanana/DF]

Hi all,
I used PGP 2.6.3 before and it was possible for me to sign a message for
more than 1 recipient name. Now with gpg, signing is always possible but
when decrypting, gpg request the password for the first signature. E.g:

When signing and encrypting:
gpg -r alice -r bob -u john --sign --encrypt file > file.dat

When decrypting:
gpg -u bob --decrypt file.dat
...
Goog signature from Alice ...
Password:

I am Bob not Alice!

Thanks in advance.
Nirina.