I only use PRINT PDF exports. However, I often find that I start doing the PDF export and I am doing an INTERACTIVE PDF. I.e., the default setting on the PDF export has changed.
For example, all weekend I was proofreading a project and the default export was PRINT. This morning, I opened the very same project (no one else working on it) and the default is now INTERACTIVE.
How is this default set?
The File Format for an Export is the last format exported. So if you export to Adobe PDF (Print) it will be the default until you export to a different format.
Every time I change it to PRINT (now) it goes back to INTERACTIVE.
If you have completed a print export (you haven't set the drop down and cancelled) and the next time you export the drop down is set to interactive, something's wrong. You might have to try resetting your prefs.