We're running SmarterMail 14.2.5711.  Ever since upgrading from 14.1, we've had complaints about the signature popping up in the wrong place.  This happens with users who have multiple signatures who are responding to an e-mail.  When they hit reply and select the signature they want to use, the signature appears below the header of the message reply.  I verified on a not-yet-upgraded 14.1 server that this does not happen.  Seems like a bug in this version.