One more suggestion

Replace in template
helpful_answers_top_bit
HTML Code:
Post $helpfulanswer[postid] in thread:
with like this
HTML Code:
<phrase 1="$helpfulanswer[postid]">$vbphrase[helpfulanswer_top]</phrase>
and add same phrase, as I did for myself

And one more. Please add flowing in plugin
Helpful Answers -- Cache Template
PHP Code:
if (THIS_SCRIPT == 'helpfulanswer'){
$globaltemplates = array_merge($globaltemplates, array(
'helpful_answers_top',
'helpful_answers_top_bit'
));
}