"Okay, Could you then tell me how I turn these two things on?"

"Sure! Here you go.2014-07-28 20-58-06.zip"

"Rob, did you find any revealing things in the log that might help us?"

"That log shows the problem in V3.1.5 in stab mode. The stuttering was also stil there in the Acro fix V3.1.3 but there were no stuttering in Acro mode."

"Not in Acro mode, but it still does it in stab and alt hold mode."

"Acro mode works with your fix"

"I'm sorry for the two pling noises in the last video I didn't realize they where there until I got home from my friend."

"Uploaded the V3.1.3 Acro fix firmware and now Acro mode works and there is also no stuttering in Acro mode! 
http://youtu.be/1xq68WqVQ9c

Hope the log file works i have no idea if i got RCOut and PID logging activated, but I did set ch6 to rate. …"

"I assume its this one: Who wants to alpha test Flybarred Acro code?  ?

It's based on V3.1.3 will I loose something else important downgrading from V3.1.5?"

"We are running the latest stable version. (the one you are given as standard, without changing to either "old" or beta.

We have tried both flybar and flybarless mode same result. "

"It seems that the problem is back in the newest firmware. (3.1.5)"

"I'm still having this issue with the newest firmware, hasn't it been fixed?"

"Thanks for the quick replies.

We have tried to unplug the telemetry, that makes no difference and shouldn't the collective be having issues with interference aswell if that is the case? 

I forgot to mention in the description that when we switch…"

"Its an original APM 2.5 that have been converted into a 2.6 by cutting the trace on the PCB. "

"Do your helis also do this?
I cannot imagine the heli flying well with this issue. "

"Okay, so the stuttering is normal?"