Hmm thats a bit strange....
The template code is:
Code:
<%if forum_karma and current_user_id%>
Karma: <%post_karma%>
<%ifnot already_good%>
[<a href="gforum.cgi?do=karma_add&post_id=<%post_id%>&forum_id=<%forum_id%>">+</a>]
<%endif%>
<%ifnot already_bad%>
[<a href="gforum.cgi?do=karma_subtract&post_id=<%post_id%>&forum_id=<%forum_id%>">-</a>]
<%endif%>
<%else%>
No Karma
<%endif%>
....so either way you should see something as it uses else.