I'm running El Capitan beta #3 and having a problem printing to a Canon IP4500 printer. The header portion of the document prints as a series of rectangles. The body of the document prints fine. This happens with documents produced in Pages 5.5.3 and Nisus Writer Pro 2.1.1. If I print to PDF the PDF document shows the same problem with the header. I'm using the latest printer firmware from Canon. Anyone else seeing this? I've reported it to Apple via the Feedback Assistant.