I frequently use Writer and so I have tried to export documents as PDF 
documents. Every time I export them as a PDF, the following message pops-up:

"This document may contain formatting or content that cannot be saved in the 
PDF - Portable Document Format file format. Do you want to save the document 
in this format anyway?"

Before, everytime I clicked "yes", the save box would come up and I would be 
in a loop until I hit the cancel button. Ever since I re-installed OOo due to 
a Windows crash, if I click the yes button, I get that warning message, but it 
saves perfectly in a PDF file.