Hello Bradley,
I checked it out and I am not getting the lose focus to work on a textbox that is set as an HTML editor. I'm not sure why it is not working. I'll put in a ticket for development to take a look.
In the end, you do have to explicitly save the information to a field on the table. When you add a blank textbox object to the screen, it is not attached to any field in the table. You have to tell the screen where to place the information in the table. If it isn't specified, the screen doesn't save the value anywhere and it is cleared.
Greg