Whole right area of Wordpress admin dashboard not showing... WP version is 2.7.1
What could be the reason? It was working before.
First, try disabling all of your plugins, and see if that fixes it. If it does, enable them one at a time until you are able to reproduce the error. That should tell you which plugin is causing the problem.
Additionally, I strongly suggest you upgrade to 3.0.1.
in Wordpress 3 they can be hidden, have you just hidden them?
I second the notion to upgrade!!