I have one computer with Mission Planner 1.3.19 loaded - when I connect to the PIXHAWK/APM via mavlink all the Standard and & Advanced Parameters are displayed in the Configure/Tune TAB ; HOWEVER, when I load Mission Planner 1.3.35 (the latest) none of the Standard or Advanced Parameters show up in the Configure/Tune TAB.
Everything else is the same (arducopter/quad setup/pixhawk controller, etc…)
I can get to the 'FULL Parameter List & Tree okay though.