make px4_sitl jmavsim misbehaving. (OSX)

[jimdgit]

When you run this from the PX4 repo following all the directions it comes up ok, BUT the moment you arm the drone just ascends without bound.
I have joystick hooked up and I can yaw and but it just keeps climbing.
I've tried everything I can think of but no matter what it just climbs.

I started this because I am attempting to help others on the discussion forum but now I am stumped.
I think it's because the baro sim is off but I have no idea how to solve that.
WARN [ecl/EKF] baro hgt timeout - reset to gps