PWM on bad pin

[looping42]

Hi,

I have a big problem on my arduino nano board (ATmega328) with WMP and NUNCHUCK.
I noticed that a pwm is on pin5 of my arduino board. This pin (pin5) is normally an input pin for the pitch rx input!
Furthermore there is nothing on the pin3 of board. This pin (pin3) is normally an output pin with PWM.

An idea ?

Conf :
MultiWii release 2.1
QUADP
WMP
NUNCHUCK
RX STANDARD (spektrum)

Thanks !

[looping42]

It's the same with the realease 1.9 and 1.7 !

I don't understand!

Anybody use this board ? Why I have a PWM on the pin D5 and nothing on pin D3? I make a mistake?

Please help me !