Voting doesn't work for QA Visitor users

Hello guys,

I'm still in testing and trying to make the QA plugin work. I discovered that QA Visitors can't vote on questions in neither of the major browsers (Chrome, IE10, FF23..). Only I can, but I have Admin status.

The interesting thing is that even giving QA Visitors all the capabilities that Admin has from the QA Settings page still won't allow them to vote up or down.

Here is my site:

I have updated to the latest version of the QA plug-in.

What should I do?

Thanks in advance?