i found a bug :
when you have the following options
Show Guest Voting Option l
on
Enable Post Minimum Check l
off
then guest are able to vote i don't how and why but they are able to vote
try this in your site
Code:
http://www.yoursite.com/forum/helpfulanswers.php?do=rate&postid=1&rank=0
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i fix this bug by editing
Enable Post Minimum Check l
on
thank you ted in advance