Top Menu Bar options disappeared


I've been playing around with this plugin, and I can't fix something which (I think) I've done.

The top menu bar, which has the Wordpress logo, the House logo, number of comments, updates etc, has disappeared for me when viewing a post or page. It appears fine within the dashboard, but when I venture out of the dashboard it disappears.

Have I done this with this plugin?

I've reset everything but it hasn't made a difference.