I fixed the "You have already voted in this poll" error displaying when you did not actually vote in that poll. Looking over the code it only took a few minutes to see what the problem was, but it made me realize that this problem may have existed for a very long time. So if you have been trying to vote in past polls and weren't able to I apologize.
Nonetheless, it is now fixed.
If you tried voting in todays poll and got the error above I have reset your vote and you should be able to now without any issues.
Also I just fixed Private Messaging (finally). I will be working on styling it over the next few hours so that it will look good.