When I try to use my old PDF settings from CS4 my interactive elements do not work. See the snapshot below.
I am able to export successfully pressing Command-E and choosing Adobe PDF (Interactive) but the images, at least in the first example I have chosen, do not reproduce properly in the PDF. See comparison of original created in CS4 (left) and the CS5.5 version (right):
I am using Acrobat X and system 10.6.8
Not "PDF print"
Adobe changed the export options for PDF to two versions, PDF and Interactive.
Which annoyed me greatly.
Yeh, that change was a bit annoying. But the main issue for me is that producing a PDF in the way that you mentioned produces some undesirable results. Have a look at the screen grabs in my post.
I have found the answer to this problem myself!
Because the interactive setting does not support spot colours being kept it causes problems with any RGB Illustrator files that have been set up using a spot colour. You may well ask why you would want spot colours in an RGB Illustrator file. Well, it's to keep any Lab values intact, but to get around the PDF colour issue you can't have any spots used in this way.