Hello Barry,
I am looking forward to reading your electronic book, but I'm encountering a problem with the pdf. Everything went smoothly until I tried to open the 3.6 MB file on my Mac Book Pro 13,3 with the latest OS 10.12.4. I'm getting a null (blank) page. I went back to my account on the Shopatron site and re downloaded each of your other books and opened each one with my existing password. They all opened fine. Any suggestions I should try?