In vertical view, I wanted to enlarge mail senders name field so I moved pane #2's right border all the way to the right, which dropped msg pane off the screen. I cannot click on the pane I moved to the right to bring the msg pane back on the screen. Tried enlarging view all the way across my two monitors--still couldn't click on #2 border to move msg pane back. Tried restarting and reinstalling TB to no avail. Tried other view options with no help.