I'm switching form APM to Pixhawk now and I'm surprised with GPS troubles. Any of 2 GPS modules I have (one with compass, other without) work fine with APM or connected to PC, but when connected to PX indoors HUD shows "No GPS" instead of "No Fix". When I test outdoors HUD shows "No GPS" and then "3D Fix". I thought it to be minor bug and started test flights, but found GPS to fail in-flight. I'm sure there was no power loss etc, power and fix leds were showing normal GPS run, but I got failsafe and had to land in manual mode. I attached flash log. Could anyone explain problem?