I am having a odd problem with the latest version of Thunderbird 31.3.0. When I type a partial address into the "To: line on a new message, TB shows me a list of possible names from the address book as always. However, I used to be able to select the one I want from the list, which leads it to appear in the address field, then type CR to go to the next field with my selected address inserted. Now when I type CR , the cursor moves to the next field, but the name I had selected is replaced with the first name in the list I was shown previously. The only way I can get an address to stay is to select it and then advance by selecting the next field with the cursor or I can select outside of the recipient field. Both CR and Tab change to the first name in the list. Also some addresses are in red and some in black as normal. Three computers/users in household have this behavior. All on Win XP.