[Admin]

Ok this works, but didn't test it enough to see if there are any bugs.

In newreply.php, replace

PHP Code:

    if ($bbuserinfo[signature]!="") {
      $signaturechecked="CHECKED";
    } 


with

PHP Code:

    if ($bbuserinfo[signature]!="" and !$DB_site->query_first("SELECT postid FROM post WHERE userid='$bbuserinfo[userid]' AND threadid='$threadid' AND showsignature='1'")) {
      $signaturechecked="CHECKED";
    }