Libretto wrote on May 25^th, 2011 at 11:44am:

Mostly a missed approach route has to be added manually : Tutorial from LD767 :You must program the MISSED APPROACH for each and every arrival runway. When your aircraft is descending on the ILS at 160 knots and another aircraft enters the active runway, you will be glad that you planned a missed approach

Ah! So you were using the "other" 767 FMC instructions and not the manual for the Captain Sim 757. ;)

Mark