Blank pages appear when you attempt to print a vendor document from within Bonfire.
You may be printing the document from within your browser in the Bonfire Document Viewer, which does not support printing capabilities at this time.
Download the file to your computer and open it using the appropriate software (eg. Adobe Acrobat, Microsoft Word/Excel). You can find the download icon at the top of the page, next to the upload date and underneath the vendor's name and the title of the file. Here is a screenshot for reference: