Weirwindle

Not on the wrong side of the planet unless the reentry is very shallow. More like 50 km off for a normal low orbit reentry. Just saying that mechjeb calculates a reentry that is accurate, but only if you are falling prograde. If you are falling retrograde normally then it is off. As if it is undercalculating the drag. I can upload a video today if you wish.

Have tried builds 760, 763, 768, and 769 #760 is the only one where I saw you fix the dragcurve

All dev versions for the last year have done this. Have tried on the newest versions also.

Hello Sarbian, I believe that, while using landing guidance through an atmosphere, you are simulating an object falling prograde rather than retrograde. I tested this against Trajectories, which is very accurate, and it's prograde setting lines up closely with you decent line. Mechjeb has been inaccurate for over a year for landings that are very shallow through an atmosphere. MechJeb can fly anything with the right attitude settings.