The version details dialog help topic doesn't mention the new "Edit Comment" function. Also, the dialog doesn't respond to F1 to bring up the help file.
Does this function only allow the person who checked in the file edit the comment? If so, then the button should probably be hidden or disabled if a different user brings up the dialog. If not, then it appears there's a bug with the comment editing.
Editing Comments
Moderator: SourceGear