PDF tab causes WSOD and PDF's don't render styles/images.

After updating our Drupal core modules to 7.54, the PDF tab for admin/config/user-interface/print/pdf brings the White Screen of Death. Digging up the PHP error log, it looks like we're running out of memory, but no matter how much memory we allocate it in a test environment, it still errors out.

We primarily need this module so that our users can save certificates and waivers as PDF files. Those waivers have the user's name on them so they need to be generated separately for each user. At the moment, the "PDF version" button produces a pdf that includes all the text but without any of the images or styles we use to create a legitimate certificate.

When trying to generate the pdf, this error pops up in our error logs:
Notice: Undefined offset: 1 in theme_print_pdf_tcpdf_header() (line 524 of /var/www/drupal7/sites/all/modules/print/print_pdf/print_pdf.pages.inc).

I am not certain that these two symptoms are related, but obviously having the pdf tab crashing isn't making the later easier to fix.