I used to have this problem ("Looking for satellites" in Drive, from PR1.0->PR1.2)and one guy at Nokia told me that the problem could lie in the antenna printed on the case. Before knowing about this I have had mainboard replaced but didn't help, after telling nokia care that this could be the solution, I got the case/chasis replaced and it now works as it should. If you did have GPS working in PR1.1 then I don't know if this info is helpful at all, you could give it a try though. Oh and this thread is for N900 btw