Same for me, I still get various pink all over no matter in what frame I make a render. Basically these nodes:

There is a lot to go through. I’m beginning to wonder if it’s better for you to start over. I mean I bet we can get to the bottom of it and see what was going on, but I bet you’ll learn so much more with the knowledge you have now if you get at it from the start and you now know what you have to focus in and you’ll be doubly fast and things you see again will make you go ooohhh I see it so much clearer now. I’ve repeated courses as much a three times in the past, we all do, it is standard practice.