Yes i got a new one and i now have 2 GPS and 1 ext compass perfectly working. No more errors.
Today as i was testing my 2 compasses wento zero sat all of a sudden but i was indoor so i guess it was a particular situation. So far everything in working on 3.6 RC10 ChibiOS.
Please read here because i wrote about some recent findings on magnetometer that i think are very useful.