According to German Auto Bild Motorsport the RB10 was firstly assembled in the night before the first day at jerez. That's also the explanation of why something as simple as attaching a spring went wrong.
They also cite Marko and Newey.
Marko: We need to redesign certain things which is a pity.
Newey (asked about what needs to be done): I'm really not sure about what needs to be done for a satisfying solution.
Source:
http://www.motorsport-total.com/f1/news ... 20513.html
/edit: writing on my smartphone is hilarious. It always swallows words.