you would have to look at the picture as I am afraid my words will only very inadequately describe the problem: from the moment of engine start onwards i have a phenomenon where air streams around the engine are brightly-neon coloured. As I increase speed they wander a bit aft, but remain visible.

What is this?? What can I do?

I have already tried switching off all aircraft lights, but that did not make any chance.

Edited September 15Sep 15 by ZugFly

Do you have the CFD Visualisation setting turned on? You can check that in the Interface Tab of the Settings and also in the Weather tab of the top toolbar of the sim.

8 minutes ago, ZugFly said:

you would have to look at the picture as I am afraid my words will only very inadequately describe the problem: from the moment of engine start onwards i have a phenomenon where air streams around the engine are brightly-neon coloured. As I increase speed they wander a bit aft, but remain visible.

What is this?? What can I do?

I have already tried switching off all aircraft lights, but that did not make any chance.

3 minutes ago, BT42 said:

Do you have the CFD Visualisation setting turned on? You can check that in the Interface Tab of the Settings and also in the Weather tab of the top toolbar of the sim.

This ^

@ZugFly

This happened to me too:
MSFS Main menu -> Try Options → Assistance Options → Piloting → Aerodynamic Visualisation and set it to OFF.

Hope that helps.

Cheers

MapleFlyer