Mission Planner was working fine but now I get a Pre-Arm check warning saying that the R/C is not calibrated. I have calibrated the radio several times but it seems as though the parameters are not being saved. Upgraded to the latest version and the same problem persists. Uninstalled Mission Planner and re-installed, rebooted, tried installing MP on a different machine and still the same error and problem. I am running Mission Planner 1.3.24 build 1.15574.33902 in Windows 7. Any ideas on how to fix this problem? Totally stumped at this point.