When starting an email with Write, for years I have been able to enter an address into the "To" window, pressing Enter would bring up another "To" window etc. until I was done with "To" entries. That is no longer possible: I can enter only one "To" entry. Also, something is odd about the color theme - the borders are a dun brown as though the Window that Write is showing in does not have the focus. I'm using Win10 64 bit, and the latest version of Thunderbird 64bit. I was surprised about two weeks ago when this problem showed up to find that my version of Thunderbird was the 32bit version. I tried to see if I had done something to misconfigure Write with no joy, so I upgraded Thunderbird to the 64 bit version This is keeping me from using Thunderbird to send mail. I'd appreciate any advice to get my Send functionality back. Thanks in advance.