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I have all settings set to PayPal Standard and I can't process product with zero price. After I click "Buy" button I get "Complete Your Order" page and after filling all fields I click "Update Customer Information" button and after that I get the same "Complete Your Order" page with same "Update Customer Information" button (no errors). My order is not processed.
Thanks for the bug report. I've just uploaded Site Membership Pro 184.108.40.206 which should fix this problem.