Another possibility is that the date has been entered in the wrong format. It needs to be mm/dd/yyyy.
Although just thinking about this it is more than likely would then have either slewed your alignment stars way off or not even let you select the bright ones for the same reason you gave, below the horizon.
Was Betelgeuse, Rigel or Sirius in your alignment star options? If not can you recall what was?
Wayne
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