Membership Communication not sending out daily autoresponders?

Hi there, have been using Membership plugin for some time, and thought would be great to send out an email to a member after 30 days of their signup.

However testing the Membership Communication it doesn't send them out.

It sends the one set to day zero, but the following days don't go out. I have tested it with some test users.

Can you please test the Membership Communication on your dev sites to see if it's a bug and let me know how you get on.

Thanks, Ian