I’m having the same problem despite contacting the Old Post people twice. The first time they said to check with my provider to get the Old Post plug in on their white list. I called Blue Host and they said all fine. I then contacted old Post again telling them this and they have completely ignored me. I even attached the System Report. Shame as rated this plug in. Any advice please let me know asap as would like to get working again. My website is https://www.robinmckelvie.com.