1. Your post says you're using "the most recent version download". But, lotsa folks "say" that and think they really do have the latest, but sometimes they've grabbed the wrong file.
What exact version do you have?
2. The newest "patch" for PayPal support in v1.3.7.x was released June 17:
http://www.zen-cart.com/forum/showth...6&goto=newpost and is included in the Zen Cart v1.3.7.1 fileset.
3. Note that my earlier posts says that the symptoms you're reporting are "typical of" using an older module. I have no idea if you are or are not.
4. If you're happy with the IPN module, this is all pointless discussion.
FYI - Website Payments Pro is now supported in v1.3.8 and newer
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