Just a simple fix/suggestion:
For the ""We cannot proceed. Username/Password not found. " error...that *could* be a cookie issue. It usually is... unless your database has deeper problems.
Try logging out, then manually delete the cookies from your site. Then log back in as that Admin user and see if that error goes away.
In
this post scroll down if you need detailed system specific instructions for deleting your cookies.
Hope that helps.
