Exactly Rainbow, that is the point I was enquiring about. Like you, I have flown other Boeings (75/76) which seemed nowhere near as prone to error (although they did get it wrong sometimes too). Just wondered if anyone knew why this happened so frequently on the 737. Obviously software related, but knowing what exactly it is would be useful when trying to explain to new guys the fallibility of the system, which many instinctively follow if they have little other experience.
PP