Kat Too,
Did you read the report? It does say they knew about the frost... It's the contributory factors to their inaction to deal with frost that is being discussed here.
Skunkie,
Thanks for sharing your story. It was very interesting to read your views on non-commander in LHS and also about the experience you had. From a simplistic point of view, I don't like the idea of frequent seat swapping anyway (slower scans unless the instrument arrangement on the LHS and RHS are the same, differences in situational awareness and in information processing, potential ergonic differences etc, as well as having a different perspective among other things) but it was even more interesting to read the actual experience you had of the danger that it contributed to (along with two captains flying together perspective).
NN