membership sign up page not working

I don’t know what has happened, but my membership plug in is acting poorly. I am using the Business Portfolio theme with BuddyPress and Membership Premium 1.0.5

After filling out the subscription form and clicking ‘sign up’, instead of being taken to the gateway choices it now takes everyone to a blank ‘subscribe now’ page–it doesn’t even show the subscription form (here is the url to that page,

And, even though it seems as though the sign up did not complete, these new registrants are shown as users and members. When I tested it myself and tried to log in I was sent back to the home page for strangers.

I have deleted the membership folder and reinstalled it, checked the options page, deactivated and reactivated the gateways, but still have the same problem.

What should I do?