Black boxes around images when printing

Some Mac users have reported that, when printing some of our pdf files, black boxes appear around the images, like this:

This seems to be a recent issue with the way Macs open and print pdf files.

Best solution:

If possible, please download the pdf file to your computer or device. Then open it with Adobe Reader, rather than Mac's Preview software, to print. 

Workaround:

You can try printing the page as an image. Choose File > Print > Advanced and then select Print As Image. Unfortunately, this will only allow you to print one page at a time, and the quality may not be as good.