You took away things that were essential to our registration process and did not give us any warning.

allow user to select a term

Display only courses offered during a term.

Since limits need to be set for min/max courses a student can sign up for USE them.  Don't allow user to sign up for more than the max number of courses.

Take away that whole box that shows Courses Selected and do it term by term.  The way it is right now is very confusing to students.