I am having the same issue on my website http://www.stevesims.com - I am integrating a membership plugin called 'Simple Wordpress Membership' and am getting the message "Invalid Regular period. You must specify valid values for the A3, P3 and T3 parameters for a subscription." when I click the subscribe button and head off to Paypal. My site isn't in Hebrew, but can you advise what changes I should make to fix this (if possible). Thank you for your time.
... View more