Woops.. I hid the admin bar by accident. I did it from the front end, it said 'hide all' or something. I wondered what it would do so I clicked it.
Now it is hidden everywhere and for all users, except when in the dashboard. The tick box in my back end profile is gone.
How do I get it back? I only user a plugin to show it only to certain user levels so I don't want it back globally.