This widget, from http://donncha.wordpress.com/flickr-widget/, has had to be removed as it hasn’t proved “user-proof”. If activated before the Sidebar Widgets Plugin is activated, we found that the blog would become unusable, displaying a blank screen.
System admins: The fix is to remove the plugin from the web server widgets directory /blogs/wp-content/plugins/widgets, then go to the now-accessible blog. This automatically de-activates the plugin for that blog. The plugin can then be put back – if you still want it. Because this requires FTP access to the web server, it’s not fixable by a student, or even a WordPress administrator – just what you don’t need in a classroom situation!
More details in the Education ICT News blog here.