Printing was not really tested in v12. It is a mess
I have started to develop a new application with v12 and I found that printing is really a mess. ditto "save as PDF".
Looks at my issue posts:
http://forums.filemaker.com/posts/94e4bab009 (officially recognized as bug)
I also found that Windows and Mac behave differently
Moreover, to have a layout that is usable for printing you need to remove all styles from all fields, because there is not a theme without styles.
So be careful if you need to print with FM v12
test files available for all issues