Thanks, not sure where to get that info on my system. Looked for a while; keep in mind I'm on a MAC. At this point I'm going to have to give up. 3DRobotics where I got the Pix Hawk won't even e-mail me back. I have no idea what the issue is, but I think others have the same issue, given the thread referenced above. I've spent countless hours on this with no progress. It's OK I'll use the NAZA system, Multi Wii or Flip 32, I have all of those working. Seems like a real shame to buy a product that doesn't work and be unable to get even an e-mail reply from the folks that sold it to me. Oh Well.