Is there a keyboard shortcut to go back (or forward) to the previous position in a book? I thought Alt+Left and Alt+Right used to work, much like a Web browser. It used to be erratic in v. 4 if you switched to another program and then back to Logos. But now it does not work at all. This is a very important for quick movement through a book. It wastes time to have to grab the mouse and point to the arrow button. Has it moved to another key or is it a bug?