Membership plugin a user cannot get logged in

A user comes to this page:
An already registered user clicks the "Already registered, click here"

They will get the login page, which is using the Theme My Login plugin, since the membership plugin does not have a log in page. However, after placing their credentials, it will not allow them access to the membership content.

Safari will display:
It will not allow the user to see anything but this page.

I really need to get this working today:wink:)

Thank you in advance for your help.
~ Barb