Why is my multisite installation causing my login to not work?

I have started over several times. I am needing to create a multisite (commoncoremathteachers.com) but everytime I update my wp-config and htaccess files, I can no longer log in.

Everything seems to be working up until it asks me to re login. Then the login screen just stays the same after I put in my login and password. No error message, just does not put me through.

Ideas?