"The 3.3 thread mentions having to set SERIAL2_PROTOCOL to 3, though that's not been sufficient for me.  I am testing with 3.3rc3.  The light on the Teensy is just giving a slow heartbeat, not the fast flashing I am accustomed to.  I would be…"

"Does anyone have any ideas on this?  Why do I sometimes get two sets of calibration values, and sometimes only one?"

"Thanks again for the quick help with this.  I confirm that master from this morning compiled with Qt 5.4.1 resolves it for me.  Can you comment how different master is from 2.0.17?  I am looking essentially for an indication of how "safe" it is to…"

"APM Planner 2.0.17 built using Qt 5.4.1 seems to resolve the menu issue, but I was unable to connect over serial: "Error opening port.  No such file or directory" followed by a crash.  So it looks like 5.4.1 still has that problem."

"Hi Bill,
Thanks for the quick response!  I just built 2.0.17 from source (are there binaries available?) using Qt 5.2.1.  Unfortunately, I get the same behavior.  Digging around in the Qt forums, I suspect it is related to this:…"

"So I think I am being affected by this.  I bought a Pixhawk direct from 3DR in December 2014.  Right off the bat (using Arducopter 3.2), I was having a lot of trouble calibrating it and would frequently calibrate it at home, and then get to the…"

"Thanks again.  If you want to link to the video, I'd definitely have a look.  The behavior will long be seared in my memory ;-)"

"Good points.  Thank you.  Once I get it rebuilt, I will rerun the vibration test, though I am a little afraid to get airborne again without knowing the cause yet.  Is it safe to assume that if I stay in stabilize mode I am reasonably safe against…"

"Hi _Milo_,

Thanks.  I did this measurement back when I first built the quad, and while I do not recall the exact results, everything was well within the prescribed limits.  I have not changed anything with the quad that should have affected that.…"