Markoz wrote on Jul 9^th, 2023 at 4:39am:

I installed the 757-200 PW Base Pack into P3Dv6, and it's doing fine at the moment (currently doing first flight in P3Dv6). The only thing I see not doing well so far is the strobe lights. They flash as black rectangles in external view (F11).

This is not a v6 issue. After installing in v5.4 or v6 this issue is fixed by editing the cs757_stb.fx file found in the root P3D effects folder. Change line 214 under [Particle.3] X Scale from 3.00, 3.00 to 0.00, 0.00 and this will fix it.