Registered users can’t submit a question

Hi! Could you help me, please. Since yesterday, when I enter into my account as an administrater and want to pubblish a question, I am still asked to complete ‘your name’ and ‘your email’ fields and then after doing this I click the button ‘submit’ and it says ‘you are trying to cheat’. I tryed to register with another account, but it’s the same. Only non registered users can pubblish questions. Those registered can’t. What should I do? To download the plugin again?