The Checklist PDFs (for Basic and Premium) are totally messed up on the Mac "Preview" app, i.e. all the text is missing. Only the lines and boxes are somewhat included.
Only Adobe Reader displays it correctly, but because Adobe Reader is big, heavy, slow and ugly and most Mac users probably don't have it installed, you might want to fix that. One reason could be that the fonts are not properly included into the PDF. I am not a guru on that stuff though. I think you should really fix this soon as there are many Mac users out there and I guess this problem affects not only the Mac, but many PDF viewers. That is because PDFs that follow the standard usually are displayed flawlessly by "Preview" on the Mac.