I have the same issue. The turbo Islander loads and then crashes XP12 after the plane is loaded and activated. I have 4 versions of xp12 on two different machines. All with realityxp which worked fine in the islander with earlier versions of XP12.
have also installed tdssim gtn on 2 versions and wprks fine with citation and cirrus entegra but Islander still crashes with the same ending in the log file that stevebker had.