Heading "went South"

I have a flying wing with APM 1.0, software version 2.3.  Last Sunday it flew multiple flights flawlessly with 4 auto landings.  I built a second wing with identical hardware but I updated the Mission Planner and the APM to version 2.33 but left the first wing with version 2.3.  When I flew the first wing yesterday, the heading was all jacked up once it got in the air.  Is this because I needed to update the APM firmware to match the latest Mission Planner software?

 

Log file attached.

2012-04-29 08-40-09.tlog

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