From a recent interview with the 2007 F1 World Champion:
Q: Looking at 2013 and the new car, the first test in Jerez seemed to be pretty positive for the team. Can you confirm that?
KR: We didn’t have any real issues in Jerez. The biggest problem here and in Jerez is basically the new software. We lose all the data when we are running – that is not very good when you are testing and you have some issues with parts and you cannot see it in real time. The car itself is running well – we just have to get that stupid data-logging system fixed. (Source)
James, if you’re reading this, we’ll gladly come out to Enstone and give you a hand 🙂