I don’t know the cause or what to do about it. It seems I can select either ‘reload’ or ‘ignore’ and just continue without penalty. Just FYI.
This is not an error message. It is a notification that the topic on which your are composing a message is presently being edited or commented on by somebody else. It’s just to invite you to read that before posting a comment, if you wish.
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Thank you. Now I understand (and incidentally understand that not all such popups are error messages).
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