Yeah I couldn't vote till I had at least 5 trades complete.
They should be giving you commission for finding them new traders lol

I've still been trading since tho it's a little hard to penalise people just cause any active orders are still waiting to be fulfilled.
They reactivated my account pretty quick after I put in a support ticket and I asked if that also meant my votes would count again ... I also suggested the Captcha idea to them

I'm still going to vote Hyper up even if the votes don't count for free Hyper !
Just looks like a good exchange to Hyper on as they have a fair few other coins that I have the odd few from trying out mining and mining pools in the process of finding Hyper 

So if you were voting and had your account locked then send them a ticket ! https://support.mintpal.com/

Let them know you're real and want your votes to count !
At least then they will at least give you a reason on why your account got blocked.