All compasses seem "fixed" now.
As I said, after 1st playing a single mission (all was ok), I fired up my career...everything was back to normal.
I used the same saved-game that I was running the day before.
I suspect the saving-system...I've seen odd things happening, especially if you hit Save&Exit, then Save, and then Continue mission (after saving succesfully).
At least in career-mode, I'm going to Save&Exit-to-menu from now on.