Paypal error "We were unable to decrypt the certificate id."

I am using s2member to generate paypal buttons and manage members… When I attempt to use a encrypted paypal button on a checkout page I get the following error from paypal “We were unable to decrypt the certificate id.” I’m not using SSL certs…

However, when I deactivate enfold and activate the the twenty fourteen or twenty thirteen theme’s the paypal transaction works fine??? I have isolated the issue to the enfold theme, however I’m struggling to understand how the theme would conflict with s2member paypal buttons???

As it appears to be a conflict with the enfold theme I am asking the question here…

What type of logs or information do you need to help me debug this issue???

Many Thanks,
Sean.