Totally desperate, titles have disappeared from footnotes citations!!

Hi 

I have been modifying Chicago 16th to meet the house style of my publishing house. I do not know what I have done but some of the titles are not appearing in the footnotes. I cannot pick up on any pattern because I have for example two books entered as books in the library, one will have its title, the other one won’t. It seems random although I am sure it is not but I cannot think of what would cause that. 

And of course my deadline is tomorrow. Typical hey!

I’m desperate. 

Any suggestion welcome.

Split/separated posting. Refer to continued and active discussion thread here.