Steps to reproduce:
1. Go to Control Panel -> Plugins Configuration -> Layout Template Plugins
2. Edit an arbitrary template, e.g. the "1 column" template by clicking on its link
3. Uncheck 'active'
4. Click 'Save'
5. The layout still appears to be 'active' in the list
6. Reopen the layout by clicking its link
7. Verify that the active checkbox is unchecked
8. Open a page's layout settings (Dockbar/Manage/Page layout) and verify that you can still select the "1 column" layout template