I've been trying to insert a U3D file into a blank PDF as described in the link below, using Adobe Acrobat Professional 7.0.9. After I click OK, nothing appears in the PDF. Any ideas? Do I have to have the CAD program that created the U3D file on my computer? http://www.adobe.com/designcenter/acrobat/articles/acr7sd3dcontent.html -- Regards, Shmuel Wolfson