I posted this a few days ago. 

 

http://diydrones.com/forum/topics/altitude-loss-in-auto

 

I am getting a little desperate here. 

 

This application is for US/Mexico Border security.  We have a sensor system in place and the hexacopter is launched on alert,  with 2.8.1 we were flying great.  We upgraded to 2.9.1b and we can't fly auto and it is killing our progress because we are stuck on this darn problem.

 

I have a background in UAV development specializing in PID tuning so while I am new to the Arducopter APM I am not new to the field.  This problem is making me crazy and I need some new eyes to look at it.

 

This is a real offer.

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If 2.8.1 worked why not use it?
I am leaning that way rapidly. I just want to be on the same page as everybody else.
Also, when all else fails format C. LOL. With regards to the APM, Reset, erase and reload firmware. Be sure to save your parameters and when you reload, use compare and be selective on what parameters you reload. Might not hurt to recalibrate everything while you're at it, radio, ESCs.
I actually just did that. Then we crashed into the shop and lost a LiPo

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