Since 1.63, the plugin stopped working for me.
After a user votes, he gets a warning 'Failed To Verify Referrer' instead of seeing the votes.
Such a shame, used to be a great plugin until last week.
The creator's recommendation (http://forums.lesterchan.net/index.php?topic=5247.0) does not help.
I'm willing to pay $10 via PayPal to the person who knows how to fix this.