I am trying to open the app dev site but it does not work I had it opened this morning but then tried to log in because I had a question about assignment 4 but then it did not work to log in and now I cant get in anymore.
The login system has some issues. If you do not (try to) login it works. If it temporarily does not work, try again after 10min.
You can also register with the site (create a separate account). That should also work properly.