One more info - just checked a few settings:
It won't work with:
Participate
Vote on polls - all members
Change vote - admin
Works with:
Participate
Vote on polls - all members
Change vote - all members
So basically users can vote and change their votes which shouldn't be working because sometimes they shouldn't be allowed to change their votes.
But in order to work for multiple options it might be the problem if the possibility of changing a vote is restricted. Maybe this could be handled differently?
