noob question

Hi everyone, I've just finished building a tricopter, put an apm 2.6 with external mag/gps on a self made mast very far from any interference, but close to the CG my apm is directly on the CG. done all the mandatory hardware config, my compass offsets are in the range of -40 to 127.

first flight in stabilize mode:  upon just a gentle lift my tricopter starts to yaw violently, trying to compensate with RC yields reverse violent yaw. 

first thought that my servo should be reversed, did so on the RC tx

second flight ---the same thing violently yaws... 

next, i hold the tricopter in my hand and giving half throttle, the thing wants to fly :) plenty of power, checking the way it tries to compensate: roll --- correct, pitch ---correct, yaw ----- opposite! 

after doing some search the only thing I found is this: http://diydrones.com/forum/topics/tricopter-yaw-servo-reversed

but the post is old and relates to the first versions of apm I have 2.6 (latest and greates + external mag/gps)

please share you expert advise! 

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