I'm running CS6 on Win 7.
When I do a print to PDF, it starts the process, but never asks where I would like to save it. It appears to run through the process but, the end result is no PDF.
So then I started to Export to PDF, and it makes a PDF, but the PDF file is broken.
I have no way of creating a PDF...
Update...It's seems to only happen on some files.
If it's only some files, try Remove minor corruption by exporting
And keep in mind that PDF export is a background task and your PDF may take some time to complete. Best way to know it's ready is to check the box to display it when finished.