Hello Karen!
I’m glad to know you are at least able to work around it. I find that LayOut can be very temperamental and I’ve really learned to walk on egg shells when I have a heavier project. In my experience, the usual cause of LayOut crashing is not the 3d model, it’s an image. Could be in a material, or in a style…
Regarding your second post, all ConDoc Drawings are grouped, even if there is only one viewport. So you will need to double-click in to select a viewport, then you will see the render options. Or just ungroup it and disable sketchup model edits in preferences. Check out this video! https://youtu.be/shMX1QseBzA
Let me know if that helps!
Mike