The problem was serious enough for the FAA to issue an emergency airworthiness directive in August 2005 to all B777 operators to revert to version three of the operating system.
If Boeing thought that this incident was similar in nature and they had no answers then the 777 fleet would be grounded ( a situation which very nearly occurred after the 2005 incident). The fact that Boeing have not issued any AD's to operators (to my knowledge) suggests that they are not concerned that the aircraft has an inherent fault that could cause another 777 to disappear. The crew in the 2005 incident were able to override the automatics and recover the aircraft. For something similar to have occurred there would have to be another undetected software failure followed by a double incapacitation. Something which IMHO would be an order of magnitude beyond 10-9.