Same here. FTM is sadly, riddled with memory leaks and inefficiencies when using the report generation or export utilities.
I would like to see Ancestry.com focus on fixing these bugs before adding more features. At current, I am having to take many of my reports and disect them into multiple publications... only to take their PDFs and merge them. And this of course causes the numbering of pages to be off, and overall make the book poor in quality.