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If you successfully log in, but are returned to this screen, it is likely that your browser is not saving cookies.
If you use the "Remember me" option, the saved cookie will last beyond your browser session. If you use the "Remember me" option but you are always prompted to log in when you visit this website, your browser is deleting the saved cookie at the end of your browser session.
You should never use the "Remember me" option on any public computer (internet cafe, library, etc.).