I can't add a widow fact to only one person in a marriage. With the online version it adds the fact to both persons and deleting it from one deletes it from both.Widow/Death of Spouse is a single sided event of a double sided relation.
Since the first marriage "didn't end" with a death, the marriage line continues to show (a full line) and a subsequent marriage makes it look like poligamy (a problem not present with divorce).
Also, when I try to add a date or any other detail to the widow facts that are there, an error message appears and the system "reboots" without saving any changes.
The error message says "A communication error has occurred while saving the update. Please click retry to try again." It happens every time even when other changes went OK before and after. So it is not a communications problem.