Just installed this. I'm getting this error after installation on every page I switch to:
Warning: call_user_func(html_mode_lock_settings) [function.call-user-func]: First argument is expected to be a valid callback in /home/oozandoz/public_html/wp-admin/includes/template.php on line 1102
Screenshot of same: http://awesomescreenshot.com/092smat26
I think that problem is gone now that I've selected Pages in the settings. HOWEVER, your plugin says we can lock on a per item basis. As far as I can see it leaves all my pages locked in the mode it was in at the time I installed. I just want to lock one page. Is that possible? HOW?