Same here no problems. I've made several flights all of them on-line and had no problems. No freezing, no low fps even in sceneries such us Flytampa's LGAV, no crashes, and i use only VC. But i take it slowly trying to do things reading the manuals. As i use the plane, the more i see that you have to do things by the book and in the way the real pilots do. Still i haven't done lot of things such as autoland, because i havent read yet how you should do it. Every time i can't do something i try to find the answer at the manuals, even though its little difficult for me to find what i want easy.The first day i bought it, i was trying to start up the engines with an external gpu and air starter, without reading the correct procedure. I gave it up after a while cause we had to go to a friends house. And there it was a real pilot doing his type rating at 738NG. As you imagine the hole evening we were talking about the plane -the real and the NGX :). Well among other things, he told me the procedure how to start the plane with air starter and gpu. As soon as i got back home, i did the way he told me, and i managed to start it.What i am trying to say is, it's not a simple add-on. We have to read the pdfs if we want to fly the NGX. Its real as it gets So, thank you PMDG for this excelent add-on.