Open two databases.
Start editing a field in the data sheet of one database.
While the editing popup window is open, click on the other database to bring its datasheet to the front.
Now click back to the editing popup window in the first database.
Your changes will still be visible in that field, but when you click outside the popup window to close the popup, your changes will be lost. Also, if you make further edits to that field before closing the popup editing window, they will all be lost. Also interesting, the Enter key (in this case function return) does not work when you get back to the first file. The escape key doesn’t work, either.
This is entirely reproducible for me. It has been going on for a long time, but I’ve never bothered to characterize it until now, when I just lost a rather large edit.
Hmm.