Ok I found what causing my CTD's, It was one of these files,
("a-puf-we-love-vfr-region1" or"a-puf-we-love-vfr-region2")
it adds mobile phone masts, tv and radio antennas, chimneys, construction cranes, radar domes and parabola antennas. for some reason it only affected my Kingair, So if your having CTDs and have one of these files it might be the problem.