In your PayPal settings under Modules --> Payment --> PayPal IPN do you have your PDT token set
http://www.zen-cart.com/forum/showpo...1&postcount=12
Usually this is the most common problem with PayPal returns. DivaVocals and myself was running through this exact method awhile ago and the return was placed has it should so checking the PDT token settings make sure it is placed.
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