Thanks for the reply Opjose - I'm still working on it. I did use 7.5 on Win10 already with relatively few problems - just the slow to load issues and the occasional won't load. The model characteristics were good - it's just this week that they suddenly changed - and the only thing that has changed is Win10 has updated itself.

As I said, I did reload and update the software - maybe there are more updates that I need to retrieve. When the update occurred I did get a dialog box that wanted me to OK updating C++ components.

I recalibrated the Tx more than once, I even changed the batteries in the radio thinking that maybe low voltage was causing a low signal especially on Ch3 - to no avail. I know that this is more than perception - the Flyzone Sensei - classic trainer - will not fly straight and level at half throttle - which it always used to - in fact it is hard to keep it "in the air" at full throttle - it's always been a "more throttle makes it climb" model. The other controls seem over sensitive - like a 3D plane - maybe that's me being rusty and confused by the throttle issue.

Next steps I'll try are re-updating the software and then maybe try a different Tx.

Any other suggestions greatly appreciated.

Edit April 25 2016: I altered the trim to max up-trim on the elevator and can now fly the model of the Sensei. Maybe I've scrambled the definition of the model within the software. Anyways I can sort of use it now - it certainly sharpens your skills at keeping a plane in the air!