On first load I ran into a problem that is a familiar one to me with P3D. The automatic configurations didn't work and the ATC window was grayed out. If you load this aircraft the first time and you notice this, delete the file Prepar3D.cfg and restart P3D. P3D will then recreate the file. This file is the same as the file FSX.cfg that FSX uses only it is for P3D. I'm not sure why this happens but it is something that P3D needs to address. You will find the file in C\Users\Your name\AppData\Roaming\Lockheed Martin\Prepar3D v4

If you have to delete this file, you will have to enter your P3D options all over again.

Any idea of why?

You didn't happen to save the prepar3d.cfg file that didn't work?

I've no idea but it happens every now and then regardless of what aircraft I use. I've seen others with the same issue but there seems to be no remedy except for what I posted. It has nothing to do with your aircraft. If P3D used the same cfg that was on there before I upgraded to v4.3 then maybe they have fixed it. Anyway, it is easily fixed if they haven't solved it.

Ok, thanks.

Seems as though I have a dead aircraft also. Flipping switches have no effect. And the Auto Config Panel pre-sets do nothing other then play their respective sounds. I was hoping to avoid it but it looks like I will have to have a prepar3d.cfg regenerated as well.