White Borders When Converting to PDFs

Hi!

When using Calibre to convert from ePub to PDF, the program used to stretch the cover image to cover the entire page. This behavior lasted until verasion 0.9.12. However, since version 0.9.13 (the one with the PDF output rewrite), the image will instead be stretched to cover the entire page minus two white columns on the right and left ends of the page.

Is there an option to revert to the earlier behavior? I tried searching the forum but found nothing relevant.

Thanks for your help!