When I try to practice in FMS, the plane bank left automatically. When I correct it it goes fine for some time  ( about 3-4 seconds) and then again banking starts. Does everyone experience this or am I the ony one?
If I am the only one, can someone tell any corrective action?

@topalle
Hope you have checked the rudder and aileron trims.
Using keyboard or Tx?
Which model?

This is what i did when faced the problem...
Goto controls > Joystick Interface, and select No Interface

i am using keyboard...
in the pitts python and Su 26 i am facing this problem

Are you using aileron ? If not , then Use Aileron by "J "& " K " (by default) tabs for flying straight .

I am using arrow keys for ailerons and elevator
I am using w to throttle open, c for throttle close, s for more throttle, x for less throttle

Topalle,

Can you PM me the Link for FMS download link.

Ashok.P