>>Just now, in thread #1522925, I kept changing my mind, adding things to the same message as they came. Before my last update, Gregory already replied, and I couldn't save the changes to my message. Being an old user here, I guessed what's going on, and copied the paragraph I wanted to add and pasted it into a new reply. There should have been a javascript alert() to tell me that I can't save an update to a message which already has replies.
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>This is because the message had not a reply at the time you started to make the update. Then, by the time you were done, someone else made an update. So, the validation kicked in on your end after that.

Just suggesting that validation may tell the user why the message can't be saved. Again, I don't need that, but someone else may be confused.