Yes, I have not given too much indications.
My RC is the last stable version (0.4), and I work in text mode.
Everything seems working fine and my signature looks "normal" but ..
If I read my sent mails with an other mail client (Thunderbird by ex) which print the signature in light gray font, all mails sent by RC have a signature with "black" font and are not recognize as such.
If I look the source of this mails, I don't found the space after the 2 hyphens in the delimiter.
Bruno