Two problems/questions on this hack.
First--does it work in both 6.0 and 6.01 or only 6.01?
I tried adding it to 6.0 and almost got it to work (see next comment below) but after trying to rate a topic, received a cgi error code about being unable to open line 63 in ubb_rate_topic.cgi. I can post the exact error message here later if you want to see it.
Second--is there an error in the readme.txt file?
You say the following in that file...
########################################
public_forum_page.pl (Templates)
--------------------------------
########################################
Find
########################################
$vars_wordlets{total_replies_header}
|
########################################
and add the follow
########################################
$vars_wordlets_rate{rating_column}