Please add your AC version and OS to your profile.
Where are you seeing this lack of transparency? Section, Elevation, 3D window?
For example in AC13 the transparency option is found on the section and elevation settings boxes
Model Display tab> Uncut Elements.
HTH
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"
