ok, dont set your comport in RR to 4.. RR and FD are both trying to use it and there having a fight !.. You might need to crop the skin of RR to stop it disappearing.. open up the external_gps.skin file in the skin your using and look for the A01,???,???,???,??? line.. then under it match it with a C01,??...
you dont need the A01 bit anymore, but it may be in your skin.. that will sort out the disappearing bit, unsure on the shake.. maybe it will sort that out as well