I create a veiw of my model using Hiddenline and it shows a good model and you see through the glass
I place that view onto a sheet of paper and it looks good
Then they do sometimes look right and most of the time change and no longer can see through glass
It sounds like what you're describing is that the window/door has a glass pane, and that sometimes elements behind that glass display and other times they do not? If so, does the window/door otherwise look as expected; i.e., the applicable Family+Part resymbolization is otherwise seen?
Also, when you say "using hiddenline", which specific Display Style are you referring to, and is it Cut Plane and/or Forward View?