Thanks Stuart.
I found the link with the explanation.
It explains why sometimes it doesn't show (when working mac) and other time it does (windows).
If someone has figured out how to set adobe on windows so its default is not to show the box because it prints, I and Dennis at least would appreciate your sharing.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"