This has changed in 6.5 final
The instructions say....
###
### Open postlist.tmpl
###
##
## Find this:
##
<a href="{$config['phpurl']}/$mode.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Number{$var_eq}{$postrow[$i]['Number']}{$var_sep}an{$var_eq}{$postrow[$i]['announce']}{$var_sep}page{$var_eq}$page{$postrow[$i]['jumper']}#{$postrow[$i]['Number']}">
{$postrow[$i]['Subject']}
#
# Change to this:
#
<a href="{$config['phpurl']}/$mode.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Number{$var_eq}{$postrow[$i]['Number']}{$var_sep}an{$var_eq}{$postrow[$i]['announce']}{$var_sep}page{$var_eq}$page{$postrow[$i]['jumper']}#{$postrow[$i]['Number']}" title="{$postrow[$i]['body']}">
{$postrow[$i]['Subject']}
It should be
##
##Find
##
<a href="{$config['phpurl']}/$mode.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Number{$var_eq}{$postrow[$i]['Number']}{$var_sep}an{$var_eq}{$postrow[$i]['announce']}{$var_sep}page{$var_eq}$page{$postrow[$i]['goto']}">
{$postrow[$i]['Subject']}
###
###change to
###
<a href="{$config['phpurl']}/$mode.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Number{$var_eq}{$postrow[$i]['Number']}{$var_sep}an{$var_eq}{$postrow[$i]['announce']}{$var_sep}page{$var_eq}$page{$postrow[$i]['goto']}" title="{$postrow[$i]['body']}">
{$postrow[$i]['Subject']}
(I think

)