Hi all,
The Log-In button is currently missing from the navigation bar at the top of Community pages, and our team is working to correct this as soon as they can. For the time being, you can log-in via the navigation bar from any other part of the site. You can also click the "Reply" or "New Discussion" buttons in Community to log-in as well.
We apologize for the inconvenience and will keep you updated as this gets resolved.
Thank you so much for your patience,
KH