InDesign issue with Illustrator files

Hello

I used CS3 without any issue until a few months ago.

Using CS6 on Mac now I have some problems importing Illustrator files into InDesign. When I export to pdf or jpg they became transparent or invisible.

Please take a look, this is the exported file (pdf or jpg are the same):

This is as it should be:

For the pdf I use the Gent PDF Workgroup - 2005 Specification Version 3.
Please, have you suggestion to fix this problem?