Helicopter rotor animation problem

[grog swiller]

It seems the rotors won't spin on many of my choppers when using FSrecorder. I know how to make the neccesary changes to get my helicopter recording to visually materialize, but the main and tail rotors won't spin when I play back the recording. I've tried a few cfg changes as it relates to engines, and I do have "record propellers" enabled within the recorder.

Does anyone know what I need to do to see the rotors spinning during playback?

Thanks