First time I used MechJeb's landing guidance tool I was in awe and thought "WITCHCRAFT!". It put my lander down exactly where I wanted. That was the last time the thing worked for me though. Ever since it's gone into "wiggle loops", warps indefinitely, comes out of warp only to continue doing nothing in 1x time, tries to maintain the landing position by diving "suicide style" towards the planet, does a de-orbit burn only to not brake while falling towards the surface etc.... It does this with anything I build, small probes, large landers, and it does it if I choose the landing spot or if I just click "land somewhere"... what's up with that? Landing Guidance is the only part of MechJeb I have problems with, everything else is still magic. Does anybody know the trick to get this thing to perform good landings every time?