Unable to add topic, redirects to homepage

Hi

I am trying to use this forum plugin on my Genesis powered website, http://www.yourmusicvault.com.

I have followed the instructions and setup a forum which is viewable on the page but whenever I goto add a topic I am redirected back to my homepage. Can you help with this please?

I have attached a shot of the last screen I see before I click 'create new topic' and then am taken to the homepage.

Thank you!

James.