Auto Checkout is on by default. It will check out component parts of an item to be edited if it is selected with the text tool. When Auto Checkout is on it will unlock the items when the document is closed. To toggle this on/off use the menu Plug-Ins>GN4>Auto Checkout. If auto checkout is on and you are editing an item and select to check in the item it will re-check out the item. With Auto Checkout off, the body component will still be automatically checked out for editing but other component parts will have to be manually checkout if editing is required.