You're exporting to PDF (Print), by the sound of it, and buttons don't work in Print PDF. Try exporting to PDF(Interactive).
And update ID to 7.0.4
Thanks for the fast response.
I fixed the issue with the preview window (saw a previous post).
However the Export options I have are:
Adobe PDF Presets...
High Quality Print
Smallest File Size
Buzzword (greyed out)
If I choose Export... I cannot see an option for exporting to PDF (Interactive) no matter which options or types of PDF I select.
However, my PDF opens in Adobe Acrobat 9 Pro - is that the issue? Even if I open it in Adobe Reader 9.3 it doesn't work.
Thanks to Peter who pointed me in the right direction I now have this working.
Select File | Export... from the menu.
On the Export dialog that appears, select Adobe PDF (Interactive) from the "Save As Type" dropdown box.
Select your preferred options on the Export to Interactive PDF dialog which appears.