having trouble logging in

people report they are having trouble logging into http://QuieroQueSepas.us. I have membership set up on it with 2 levels free and premium. Strange thing is, even when I try to log in, it doesn't work, I get a no-access notice. When I am logged into admin I am able to log into the site.

I'm wondering if I could start over from scratch. If I deactivate the membership plugin.
Additionally, I think the Buddy Press is confusing the issue. So I'm thinking about disabling that too. Just to have people visit the site, read articles, comment using the commentsplus plugin.

Please advise.