I found the issue, when I accidentally started in safe mode, it worked fine, so I tinkered with the airport (wsss, zbaa, zspd, vhhh, wadd), no difference.
Since the only other major thing that is turned off in safe mode, is the airac, I decided to uninstall that one, and low and behold, it worked, reinstalled navigraph and the airac, and the fault is back.