I am having the followng problems and not sure how

Hi I am having the followng problems and not sure how to resolve:

1. Users can't create a "free level" membership. It doesn't show any errors just doesn't move to next screen. The signup is set to $0.00.

2. Users can login to their site but when clicking "visit dashboard" it won't them to the back-end and pulls up a blank screen. I do have the redirect-primary-blog.php installed correctly.