Has anyone had any problems running P3D v4 from within EnvDir? If i start the P3d from desktop, trackir works, but when i do it from within the EnvDir, the second TrackIr light doesn't light up resulting in not having the tracking functionality in P3D. Haven't found anything on web so this looks like a problem of mine only??

Thanks for any ideas what i did wrong. 

If TrackIR and P3D don't both run as administrator or non-administrator, P3D may not acquire TrackIR.  If ENVDIR runs as administrator, it may run P3D as administrator.

So simple and yet so hard. Haven't thought about it this way but it sure works the way you've explained it. Thanks a lot.