Found another quirk. Autopilot tracking course straight just slightly to left but Flight Director command bar is in a bank. This is running xplane on Mac. Also, Got Corvalis to run in window xp but there were even more quirks, trying to even get Simavio to run with Corvalis took a huge frame hit, could not run together. Guess I could get ATI 5770 card when I have extra $$$$. So gave up on that and went to check if GPS errors were there, had even more problems tracking in GPS. Gave up there and went back to Mac partition. Reinstalled Corvalis 1.3, thats when I found Flight Director anomaly.