If you keep getting browser errors around security certificates or 400/500 errors you may need to remove your cookies/cache or reset your browser altogether.
You can find instructions for doing this in the links provided for this FAQ.
If you keep getting browser errors such as 400s and 500s or secirity certificate errors you may need to clear your cookies and/or cache. If that doesn't work please try to reset your browser altogether using the links in this FAQ.