Mine had been going in and out. Some days the login is gone, some days it's there. Make sure to read the instructions for reapplicants when you start so you don't have to re-do everything.
Because this app cycle (2011-12) is closed. The new app cycle opens june 4th. U just login with ur same info username and pw then. Everything will still be there saved. U will be able to add new coursework etc whatever else before u submit for 2012-13 app cycle.