Lost the ability to have sperate blog/shop

Okay so I am kind of new to this but have the following set up.

Wordpress (latest version) multi site, market place plugin and now Buddy press. All configured on the 'Network' theme.

Now the problem I have is that when people sign up they don't get a seperate blog/shop, which is what happened before. they just get access to the Buddypress bits.

I've searched through the settings but cannot find anything that will help me solve this.

People need to be able to sign up and have their own blog/shop and access to the forums under one account.

help :0)