To reproduce this issue: 1. Click on "Write" to bring up new email window. 2. Type a couple of characters in the first "To" dialogue so that a list of auto-complete email addresses appears. 3. Use the mouse to select any auto-complete address except the first one. 4. Press Tab or Enter to confirm the selection. 5. Focus move to the next dialogue box, but the first "To" is filled with the *first* auto-complete address, not the selected one Thunderbird 31.3.0 on Windows 7 Professional SP1 Anyone else seeing this? Apologies if it's already logged, I didn't find it after a quick search. Thanks, Chris.