Pages not found when member logs in

Hello,

I am building a store/member site for a client. I am setting up and testing members. I have successfully made a generic free and 1$ subscription with correct permissions etc... I have successfully created two members using these channels. The site functions correctly to that point. But when I log in using the members i created... every link on the site resolves "page not found." I am totally confused. I log back out and the site works fine again? Please help!