Recently had a problem with the config. warning CB popping out just before or during T/O which would not reset.
I hope the engineer who subsequently tried to convince me that it was alright to fly as 'we can see for ourselves that we are in the right config.' reads this thread and learns something.
It's a shame you always get one w*****r in a bunch of mostly excellent engineers.
Just for the record - after 2 cancelled flights and many ours later it was fixed and back in the air.
PJ