ok, so I've been saving my last position and resuming from that saved situation a number of times, and I see that my engines are all belching black smoke.am I doing (or not doing) something that's causing this?if I start the sim out with a fresh start (as opposed to loading a previously saved flight), I don't see this.do tell.

See the 747X FAQ in the PMDG OPs wiki section: http://ops.precisionmanuals.com/wiki/PMDG_...fails_to_reload

well, and here I was thinking this was some sort of condition they got in if you flew for too long without an oil change or some other form of 'maintenance'.