Negative altitude reading

Hey guys,

A group of us went out for a flight today and all was good aside from one member of the group having a faulty altitude reading  saying -2.14xxxxxx metres.  Exactly as mentioned here:

Stabilise mode works fine, but obviously alt.hold and loiter would just kill the motors.

The member tried resetting the APM, re-flashing the latest version of Arducopter, but nada.  Does anyone have an idea why this may have happened or how to fix it?


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