Blank PDF files when published with Corel X7

Ever since I upgraded to X7, when I publish a PDF file from my CorelDraw document, the PDF file is blank. It is completely empty. All the pages show up - they are just empty.

This happens with any type of PDF - for web or for print. 

 

When I try to publish it again and overwrite the old one, it is still blank.

But when I delete the old one and try to publish again, sometimes I get a perfect PDF, other times it is still blank.

I've never had this problem before X7. It is a little irritating when I'm in a hurry and need to send a client a PDF.

 

Any help on how to fix this would be much appreciated!

UPDATE: This issue has now been fixed. I reinstalled CorelDraw X7 and I have no more problems with PDFs.